Is Allowing Harm the Same as Causing It?

An unattended shopping trolley is rolling towards someone’s car. One person pushes it towards the vehicle; another stands nearby, able to stop it with an outstretched hand, but lets it collide. The outcome is the same. Are their actions morally the same as well?

The philosophical distinction between doing and allowing harm does not map neatly onto acting and doing nothing. Philippa Foot argued that initiating or sustaining a harmful sequence usually counts as doing harm, while failing to interrupt an existing sequence is closer to allowing it. Yet an omission can itself violate an active responsibility. A security officer who deliberately fails to close a leaking valve while on duty cannot escape responsibility merely by saying that nothing was done.

Defenders of the distinction note that our duty not to interfere with others is generally stronger than a duty to prevent every harm occurring in the world. Critics reply that when someone can prevent serious harm at negligible cost, “I did not cause it” can place a formal description above an avoidable outcome.

My judgement is that the distinction matters, but it is not an automatic reduction of responsibility. Assessing the bystander requires asking whether intervention was safe and possible, whether the person held a protective role, whether they helped create the risk, and what prevention would have cost. The person who pushed the trolley initiated the harmful sequence and normally bears more direct responsibility. But if the bystander was the car park attendant, understood the danger and deliberately withheld easy assistance, the omission may also be grave. What matters is not merely whether the body moved, but the person’s relationship to the harmful process, those affected and their existing responsibilities.

https://plato.stanford.edu/entries/doing-allowing/