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.
Candidates don't have to deal with reality. They talk about the wonderful things they can accomplish as if advocating them is the same as achieving them. They live in a world of political make-believe in which everything from reconciling conflicting interests to paying for costly programs is easy.
Sometimes there is a greater lack of communication in facile talking than in silence.

