Why Does Morally Better Not Always Mean Required?

A colleague becomes ill at short notice. After finishing your own work, you give up a weekend to complete theirs. The act is praiseworthy, yet if you already had family commitments and declined, we might not blame you. Philosophy calls an action that is morally good and permissible, but not strictly required, supererogatory.

In his 1958 essay “Saints and Heroes”, J. O. Urmson challenged a classification that recognised only duties, prohibitions and morally indifferent acts. Heroic rescues and saintly self-sacrifice are hardly indifferent, he argued, but neither can they easily be demanded of everyone. The point was not to lower moral standards, but to preserve the difference between praise and blame.

A dispute follows. A strictly maximising consequentialism, under which one must always choose the act that produces the most good, struggles to accommodate supererogation: if one option is better, it appears to become required. Defenders of supererogation reply that personal projects, special relationships and excessive costs can generate permissions that separate the best act from what duty demands.

Geoffrey's judgement is that the distinction is necessary but open to misuse. Whether an act exceeds duty depends on the urgency of the need, the agent's role, the cost and the availability of others. A firefighter rescuing someone while on duty is not performing an optional favour; a bystander who accepts grave personal risk may be going beyond duty. If every good act becomes obligatory, praise turns into unlimited blame. If basic duties are redescribed as generosity, responsibility disappears.

https://plato.stanford.edu/entries/supererogation/
https://philpapers.org/rec/URMSAH