Trump or Hillary as President, who else is petrified?

[Chase]

You know, it's the funniest thing, I never would have guessed Beaux was antisemitic, and you know what? There's probably a lot of people out there in the deep blue "safe states" that you would never guess are going to vote for Trump.
There not bad people, I know plenty of people who openly support Trump, usually it's because they're convinced Trump is the lesser evil, or they believe in the conspiracy theories behind Clinton, or they have pet issues like guns or small government, but mostly, they want to crash the system.
After Hillary's lead in the polls plummeted, you may think she still has it in the bag with the small lead she still has, but whether Trump has a 30% chance of winning, or a 10% chance, it's still a very dangerous game of Russian Roulette.
Trump supporters usually claim this is only because of the stigma, that they are afraid of being accused of racism or stupidity, and that the truth will come out in the voting booth, where they're anonymous. There is a stigma, of course. A call from a telephone pollster might sound anonymous enough to not fear being judged, but due to wonders of human psychology, it really isn't. See the Bradley Effect.
A vote for Jill Stein will accomplish nothing. Maybe her or Johnson had a chance earlier, after all, at one point Johnson was polling at 12% and he needed 15% to be allowed in the debates, but Johnson plummeted in the polls, and Trump jumped up. No third party will win at this point in the election. If Hillary wins, she won't enact more liberal policies because of green party votes because she still won in spite of them. If Hillary loses, then enjoy the Trump presidency, because Stein will be more vilified than Nader was in 2000, and 4 years is a long time. Even if you impeach Trump, you'll only be stuck with Pence.
Even if your area is going to vote Hillary in the electoral, she needs to beat Trump in both the electoral and the popular vote to send the message that America rejects Trump.
I'd love to see universal health care in the USA, but my vote for Hillary is a compromise I have to make.
There are so many reasons, be it saving us and future generations from paying off the national debt, which under Trump would skyrocket thanks to his tax cuts to the rich, while as economists predict Hillary's plan would curb it at least half a trillion; or preventing millions of undocumented immigrants from mass deportation; or preventing a ban on Muslim immigration, which goes against our country's most sacred values of freedom of religion; or the very fate of the planet from the crisis of climate change, Hillary may condone fracking, but Trump has stated global warming is a hoax, and will rip up the Paris Agreement on day one.
A vote for Jill Stein is a vote for Trump. If you want to vote third party because you are idealistic or hate Hillary, go ahead, but be prepared for 4 years of "I told you so" if Trump wins.