Being a human means accepting promises from other people and trusting that other people will be good to you. When that is too much to bear, it is always possible to retreat into the thought, “I’ll live for my own comfort, for my own revenge, for my own anger, and I just won’t be a member of society anymore.” That really means, “I won’t be a human being anymore.”
You see people doing that today where they feel that society has let them down, and they can’t ask anything of it, and they can’t put their hopes on anything outside themselves. You see them actually retreating to a life in which they think only of their own satisfaction, and maybe the satisfaction of their revenge against society. But the life that no longer trusts another human being and no longer forms ties to the political community is not a human life any longer.
Philosopher Martha Nussbaum on How to Live with Our Human Fragility