Philippa Foot is most known for her invention of the Trolley Problem thought experiment in the 1960s. A lesser known variation of hers is as follows:
Suppose that a judge is faced with rioters demanding that a culprit be found for a certain crime. The rioters are threatening to take bloody revenge on a particular section of the community. The real culprit being unknown, the judge sees himself as able to prevent the bloodshed from the riots only by framing some innocent person and having them executed.
These are the only two options: execute an innocent person for a crime they did not commit, or let people riot in the streets knowing that people will die. If you were the judge, what would you do?
This is an interesting question. From Foot’s own neo-Aristotelian ethical naturalist perspective, I don’t think she would accept executing an innocent person.
Her account of the practical rationality of the Sudetenland farm boy who chose death over joining the Nazis seems to indicate her preference for avoiding participation in others’ evil acts.
Just as well, it seems to conflict with virtues such as courage (giving into fear of a riot), wisdom (abandoning the rule of law to placate a mob), justice (murdering an innocent person), and so on.