I am going to hate every fucking idiot who votes for the man with a passion, and I suspect a lot of people will be like me. And I don't want to hear, "OMG you are so angry just over politics" because the people who said that in Germany 1933 are among the villains in history and they were responsible for one of the greatest tragedies -- perhaps the greatest tragedy -- in human history.
More importantly, if Trump wins, it means democracy is no longer viable. Trump isn't just the worst candidate ever; he's almost the worst candidate imaginable. ALL of his ideas are idiotic. EVERYTHING he says is a lie. There's nothing redeemable about his administration at all. If people still vote for him, if they still elect him despite that, the damage will be incalcuable.
And finally, if Trump wins, massively catastrophic climate change will be unavoidable. We are already behind our minimal commitments we made at Paris. The world needs to go faster in decarbonizing, and Trump is going to go backwards. The rest of the world will follow our lead.