Rabbi Berel Wein, some time ago:
"There is a famous hassidic story about a king and his wise adviser who discover that the grain crop of the coming year contains a substance that, when ingested, induces lunacy. Since the kingdom is wholly dependent on the local grain crop for its sustenance there is no escape from consuming this lunacy-inducing grain.
The king initially suggests that he obtain healthy grain for himself, his adviser and their families. But the adviser gently reminds the king that if everyone else in the country is insane and only he and the king remain sane, they will be judged the insane ones.
The king sighs and says, 'You are right. We also will eat from the lunacy-inducing grain to be like everyone else. But let us at least put a mark on our foreheads so that when we look at each other we will realize and be reminded that we are really insane!'