3.1.2 - Strengths and weaknesses of ethical decision-making theories
Should moral decisions follow objective goods, respond flexibly to circumstances, or cultivate a wise character? Aquinas' natural moral law and double effect, proportionalism, Fletcher's agape-centred situation ethics, and Aristotle's virtue ethics answer differently. We will explain how each method handles rules, intentions, consequences and practical wisdom, then evaluate which offers the clearest and most humane guidance in difficult cases.
How To Evaluate A Decision Method
A strength or weakness is not just a like or dislike. In this AQA bullet, students need to judge whether an ethical theory is a good way of making moral decisions. That means asking what the theory gives to the person who must decide what to do.
Ethical decision-making method
An ethical decision-making method is the rule, value, aim or character standard a theory uses to decide what action should be chosen.
The theories in this topic locate moral judgement in different places:
| Theory | What it treats as morally decisive | First decision question |
|---|---|---|
| Natural moral law and double effect | Right reason, objective human goods, intention and the moral kind of act | Does this action fit natural law and avoid intending evil as a means? |
| Proportionalism | The balance of values and disvalues in a concrete case | Is there a proportionate reason to set aside the usual rule or tolerate a bad effect? |
| Situation ethics | Agape love in the particular situation | Which action best serves self-giving neighbour-love here? |
| Virtue ethics | Virtuous character, eudaimonia and practical wisdom | What would a practically wise, virtuous person choose? |
So evaluation should test the method, not merely the conclusion. A theory may reach an attractive answer for one case but still be weak if its method is vague, inconsistent or too dependent on guesswork. Another theory may seem strict in a difficult case but still be strong if it protects important moral goods clearly.
Use these criteria throughout the lesson:
| Criterion | Evaluative question |
|---|---|
| Clarity | Does the theory give a clear enough guide for action? |
| Flexibility | Can it handle unusual or tragic cases without becoming arbitrary? |
| Protection of goods | Does it protect life, truth, justice, love, character or community from being sacrificed too easily? |
| Attention to persons | Does it consider real people affected by the decision? |
| Moral depth | Does it consider intention, motive, habit, character and long-term formation? |
| Reliability | Could different agents use the theory responsibly and reach defensible decisions? |
Natural Law And Double Effect
Natural moral law is a strong decision-making method because it gives moral reasoning an objective structure. Aquinas does not begin with personal preference. He begins with practical reason: human beings should pursue genuine goods and avoid what damages them. In moral decision making, that means asking whether the act fits goods such as life, truth, justice, rationality and social living.
Double effect adds further precision. It distinguishes between what the agent intends and what the agent merely foresees as a side effect. This matters because an action with a good aim may still be wrong if the agent chooses an evil means. A defender can argue that natural law is therefore not a blunt rule book. It examines:
- the kind of act chosen
- the agent's intention
- whether a bad effect is intended or only foreseen
- whether the good reason is proportionate
- whether the action respects basic human goods
| Strength | Why it matters for decision making |
|---|---|
| Clear moral limits | It protects goods such as life, truth and justice from being overridden whenever a useful outcome appears. |
| Objective language | It gives students reasons beyond "I feel this is right" or "society happens to approve". |
| Intention matters | Double effect notices that choosing harm as a means is morally different from regrettably foreseeing harm as a side effect. |
| More nuanced than simple legalism | It can consider intention and proportion, not only the outward action. |
The same features create weaknesses.
| Weakness | Why it threatens the method |
|---|---|
| Possible rigidity | If the rule is applied too strictly, the theory may seem unable to respond to desperate cases. |
| Disputed human goods | Critics may ask whether Aquinas' account of natural purposes can be accepted by all moral agents. |
| Difficult intention distinctions | It is not always clear whether a bad effect is really only foreseen or is part of the means chosen. |
| Proportionality can become vague | Even natural law needs judgement about whether the reason is proportionate. |
Theft and lying show the balance. Natural law is strong when it explains why selfish stealing or manipulative lying are wrong: they damage justice, truth and trust. But the protective-lie case creates pressure. If lying to a violent attacker protects an innocent person, critics may say natural law's refusal to permit direct falsehood is too inflexible. A defender can reply that the theory protects truth precisely because trust is fragile, and that concealment or refusal may protect the victim without directly choosing a lie.
Natural law is strongest when stable moral limits are needed; it is weakest where those limits seem to produce an inhumane answer in an extreme case.
Proportionalism
Proportionalism is best understood as a flexible development of natural-law reasoning. It does not begin by saying that rules are worthless. It begins by saying that a serious moral rule may be set aside, or a bad effect tolerated, when there is a proportionate reason in the particular case.
This gives proportionalism an obvious strength: it handles moral conflict. Real decisions often involve competing goods. Telling the truth may expose someone to danger. Preserving property may conflict with urgent human need. Protecting one person may create risk for another. Proportionalism asks whether the good protected is serious enough to justify the bad effect or the exception to the usual rule.
| Strength | Why it can be persuasive |
|---|---|
| Flexible without being careless | It keeps moral rules in view but allows exceptions only for serious reasons. |
| Sensitive to complex cases | It notices that moral decisions often involve mixed goods and harms. |
| Humane in emergencies | It can respond to cases where strict rule-following appears cruel or unrealistic. |
| Useful bridge between methods | It shows why consequences matter, while still beginning from natural-law goods. |
The weakness is that proportionalism may lose the clarity that made natural law strong. If rules can be laid aside whenever a "greater good" is claimed, critics ask who decides what counts as greater. The method may become too close to consequentialism: the right action becomes whatever produces the best overall balance, even if the action itself looks morally wrong.
| Weakness | Why it threatens the method |
|---|---|
| Vague calculation | It may be hard to weigh truth, life, justice, trust and harm on one scale. |
| Risk to moral absolutes | Rules may become easier to override than natural law allows. |
| Possible hindsight justification | A person may decide first and then claim the reason was proportionate afterwards. |
| Tension with traditional natural law | Critics such as John Paul II argue that some acts cannot be made right by good intentions or better outcomes. |
The best AO2 judgement is precise: proportionalism is strong where moral rules conflict with urgent human need, but weak if "proportionate reason" becomes an elastic phrase that justifies whatever result the agent already wants.
Situation Ethics
Fletcher's situation ethics is strong because it is direct about persons. It asks what action best serves agape, or self-giving neighbour-love, in the particular situation. Rules about truth, property or duty may guide ordinary decisions, but they are not absolute if following them prevents the most loving action.
This can be persuasive because many moral dilemmas are not solved well by mechanical rule-following. A decision about lying, stealing, punishment or care may involve frightened, vulnerable or dependent people. Situation ethics makes the agent ask who is affected and what love requires for them, not simply which rule is printed in advance.
| Strength | Why it matters for decision making |
|---|---|
| Person-centred | It keeps human need and welfare at the centre of moral reasoning. |
| Flexible | It can respond to exceptional cases without pretending all situations are the same. |
| Simple central norm | Agape gives the theory one clear aim: self-giving love. |
| Challenges cold legalism | It prevents rules from being treated as more important than people. |
The main weakness is that agape may not give enough guidance. Two agents may both claim to act lovingly and choose opposite actions. One may say a protective lie is loving because it saves life; another may say honesty is the deeper love because it respects truth and agency. Situation ethics also depends on predicting consequences, and consequences are often uncertain.
| Weakness | Why it threatens the method |
|---|---|
| Agape may be vague | "The loving thing" can be interpreted differently by different people. |
| Consequences are uncertain | The agent may not know what action will really produce the best outcome. |
| Risk of justifying harmful means | Serious wrongdoing may be excused if the agent says it served love. |
| Dependence on the agent's judgement | The method may be only as reliable as the moral perception of the person using it. |
Fletcher's defender can reply that the criticism should not exaggerate the problem. Situation ethics is not "anything goes": it has one absolute norm, agape. The stronger criticism is more careful: agape may be morally attractive but not sufficiently precise as a decision procedure.
Virtue Ethics
Aristotle's virtue ethics is strong because it refuses to reduce moral life to isolated choices. It asks what kind of person the agent is becoming. A decision is not judged only by rule-obedience or outcome, but by character, motive, practical wisdom and the role of the action in a flourishing life.
This gives virtue ethics a depth that many decision methods lack. A student who lies once to avoid embarrassment and a person who repeatedly lies to manipulate others are not just producing separate false statements. They are forming, or revealing, character. Virtue ethics can explain why habits matter and why moral education is central.
| Strength | Why it matters for decision making |
|---|---|
| Focus on character | It explains why repeated actions shape the moral agent. |
| Attention to motive | It distinguishes outwardly similar acts done from different inner dispositions. |
| Practical wisdom | It recognises that real cases need judgement, not only rules or calculations. |
| Positive moral aim | Eudaimonia gives ethics a vision of flourishing, not merely avoiding wrongdoing. |
Virtue ethics also has a guidance problem. In an urgent dilemma, "what would a practically wise person do?" may feel less immediately helpful than a rule or calculation. The theory depends on recognising the virtuous person and understanding what the mean requires in a specific case. Students should also avoid a common mistake: the Doctrine of the Mean is not a permission to find a moderate amount of wrongdoing. Aristotle says some actions, such as theft, already imply badness rather than a virtuous middle.
| Weakness | Why it threatens the method |
|---|---|
| Less immediate guidance | It may not give a quick yes/no answer in a crisis. |
| Depends on formation | A badly formed agent may not know what virtue requires. |
| Disagreement about virtues | People may dispute which traits count as virtues and how they apply. |
| Possible social limitation | Aristotle's account arose in an ancient context that needs critical handling today. |
Virtue ethics is therefore strongest as an account of moral formation, motive and wise judgement. It is weakest if a question requires a fast decision procedure that any agent can apply without already possessing good character.
Virtue ethics is powerful because it asks who the moral agent is becoming; its cost is that it often guides through practical wisdom rather than a simple rule.
Comparative Judgement
A mature evaluation does not declare one theory always strong and the others always weak. Each method protects something different.
| Method | What it protects best | Main cost |
|---|---|---|
| Natural law and double effect | Stable goods, moral limits, truth, justice and intention | Can appear rigid in tragic cases and depends on disputed accounts of natural goods |
| Proportionalism | Serious moral weighing in complex cases | Can weaken rules and become vague about what counts as proportionate |
| Situation ethics | Persons, context and agape | Can be subjective if love and likely consequences are unclear |
| Virtue ethics | Character, motive, habit and flourishing | May not give quick guidance to the inexperienced agent |
Use a controlled case to build judgement. In ordinary selfish lying, natural law and virtue ethics look strong because they explain why truth and truthful character matter. Situation ethics also condemns the lie if it serves only self-interest, but it may need more explanation to show why agape requires honesty. In the violent-attacker case, situation ethics and proportionalism may look stronger because they can justify protecting an innocent person even if an ordinary rule is broken. Natural law can reply by protecting the deep good of truth, but critics may think its answer is too demanding. Virtue ethics gives a different kind of answer: the practically wise person must judge courage, justice, truthfulness and protection of the vulnerable together.
The AO1-to-AO2 bridge is this:
| AO1 content | AO2 judgement it can support |
|---|---|
| Natural law is deontological and rooted in right reason and basic goods. | It gives stable moral limits, but may be too strict in cases where a rule seems to harm persons. |
| Double effect distinguishes intended means from foreseen side effects. | It adds nuance, but the distinction may be hard to apply consistently. |
| Proportionalism allows rules to be set aside for proportionate reason. | It is humane and flexible, but may slide towards outcome-based justification. |
| Fletcher makes agape the one absolute norm. | Situation ethics is person-centred, but agape may not be clear enough as a guide. |
| Aristotle makes virtue, practical wisdom and eudaimonia central. | Virtue ethics explains moral character deeply, but may be less useful as a quick decision procedure. |
A stronger paragraph avoids the thin claim "some theories are strict and some are flexible." It says what each theory protects and what that protection costs:
Natural moral law is strong because it protects truth and justice as objective goods rather than allowing them to be sacrificed whenever a good result is expected. This makes it reliable in ordinary cases such as selfish theft or lying. However, Fletcher's situation ethics may seem stronger in extreme cases because agape directs attention to the people who will be harmed if a rule is followed mechanically. The weakness is that love can become vague, so proportionalism may offer a middle route by asking whether there is a genuinely proportionate reason. Even then, virtue ethics adds something the others can miss: the long-term formation of a truthful and just character. Therefore, the most defensible judgement is that no method is strongest in every respect; the strongest answer depends on whether the decision most needs clear limits, flexible weighing, loving attention to persons, or practical wisdom.
Synoptic link: this lesson belongs to the C1-normative-ethical-theories and C1-ethics-synoptic clusters. It prepares later essay work comparing ethical theories, but it does not replace separate lessons on theft and lying, life-and-death applications, conscience, meta ethics, or Bentham and Kant.