Also, at least 27 percent of bears shit in the woods.
I mean what other choice is there? The way US elections are designed (electoral college, distribution of state representatives, re-drawing local districts on whims, unlimited amount of money being able to be poured into campaigns without any oversight or even reporting requirements, etc.,) voting for a third party is throwing your vote away. So you vote for the lesser evil. Unless you are so brainwashed as to vote against your own self-interest out of fear of the other side.