You can make yourself feel better about yourself if you project your shadow side, if you project your own potential for evil onto someone else. By annihilating them and, therefore, your shadow, you bring yourself into some state of purity or reformation.
“I don't get offered many dramatic roles. As soon as my face pops up in a movie, everyone knows I'm the funny guy.”
“Democracy no longer works for the poor if politicians treat them as a separate race.”