I don’t think ethical vegetarians deal with this problem by literally remaining ignorant of what other people are eating, but rather there’s a truce between ethical vegetarians and meat-eaters, involving politeness norms which make it impolite to call other people’s dietary choices unethical.
I agree that at least soft rewards/punishments (such as people associating more with ethical vegetarians) are usually necessary to keep ethical principles incentive-compatible. (Since much of ethics is about finding opportunities for positive-sum trade while avoiding destructive conflicts, many such rewards come naturally)
I don’t think ethical vegetarians deal with this problem by literally remaining ignorant of what other people are eating, but rather there’s a truce between ethical vegetarians and meat-eaters, involving politeness norms which make it impolite to call other people’s dietary choices unethical.
I agree that at least soft rewards/punishments (such as people associating more with ethical vegetarians) are usually necessary to keep ethical principles incentive-compatible. (Since much of ethics is about finding opportunities for positive-sum trade while avoiding destructive conflicts, many such rewards come naturally)