There is a fallacy there - you believe, that if voting Republican does not improve situation, but can likely be detrimental, its better to stick with alternative. The caveat is that this is the reasoning of people functioning reasonably well in current society. If you put yourself in shoes of those who are definitely not happy now, for them the choice is quite different - status quo, which is unacceptable, or change, which may be good or bad. They will choose change most of the time, because they don't perceive how it can come out worse for them. Or, at the very least, change will make those higher in the ladder in trouble too, which can be actually attractive as "bringing justice", even if it does not improve situation for anybody.

People tend to prefer being miserable with everybody else than on their own.