It comes down to this: do you want to elect a toddler that throws constant tantrums and never tells the truth on anything, or a supervillain who has been behind conspiracies before. I'd point out here that Trump said "I've never made a campaign promise and never will, I make campaign suggestions" meaning his policies are completely a mystery box. Clinton on the other hand has Bernie supporters to deal with, meaning she's going to be pushed more and more liberal to prevent a left wing Tea Party situation.
Some people are horrified at what the villain would do, and vote Republican. Others would be ashamed beyond words for the toddler to get in and be seen as the face of their people, and vote Democrat.
I hate the toddler, but I can understand people avoiding the villain too.
I think the main thing to do is for those of us who are moderates to tell the far right and left wings to shove their insanity up their ass sideways and actually stay politically involved so this doesn't happen again. Because right now? The only people who are reliably politically active are wackos, we sane folks always seem to just give a fuck starting in October and just grumble the rest of the year.