Bob long ago learned the painful lesson that Humans Are Bastards. They kill each other over the most trivial of reasons and treat anyone who is different as an outcast. And so Bob has given up on them, perhaps to the point of becoming the villain or even the Big Bad.
And then along comes Alice, a shining example of why humans aren't that bad after all. She'll listen to Bob's rhetoric about how [...] [tvtropes.org]