A) argument from conscience:
Voting for an evil person means also enabling and actually helping them to do evil things, it means being an accomplice. If all choices are evil, then not choosing is only valid. You put emphasis on the outcome and the result, but it is not the end of the journey that matters.
B)argument for long term change of political landscape
By constantly voting for lesser evil between more evil options every cycle, you are only perpetuating the state and you'll keep getting more evil options. Which is exactly what is happening in US politics. By not voting, you are effectively saying to gain my vote you need to earn it by choosing a good candidate. By not voting for one of two major candidates, you are saying there is a third option you want to vote for, and you are willing to do it in the future. We can see throught other countries histories how quickly third options can surge and effectively killing mainstream options before them. I understand this is more difficult in US system, but not impossible. Isn't it exactly how Lincoln and republicans came into power first time? Yes, I realize it was a long time ago and a lot of has changed.
Finally, some people are just apolitical and won't care until their ass is in the sh"t.
P.s. blaming people for not voting the way you want is not gonna turn them to your side, probably just the opposite.
What, I don't understand is why aren't there massive protests against trump. When trump lost the election he organized the coup and attack on capitol. He is now seizing power in most illegal way and there are no tens of thousands protesting in front of the white house and congress? You should be "storming" to DC in hundreds of thousands.
A. Just reducing everything to calling a person evil is overly simplistic and, in my opinion, useless when applied to voting. Say both candidates have policies on issues A and B that you think are evil. So you just say "both candidates are evil". Problem is, two candidates never have an equally evil set of policies. So both candidates are functionally the same on issues A and B, but Candidate R is leagues worse on issues C, D, E, and F so just saying "both candidates are evil" because of issues A and B completely ignores the outcomes that make the country and world far worse because of issues C,D,E,F, etc.
So I find that angle fundamentally flawed and not a sound way to make a decision.
B. No, it is practically impossible now. After Citizen's United there is simply no way a third party will ever be able to compete with the money in politics.
Even before Citizen's United, the only two times it was viable in the last 150 years were when Perot, a billionaire himself, poured a ton of money into a campaign in 1992 and then, depending on accounts, one or both major parties did some shady shite to force Perot out. Before that, you have to go way back to 1912 and a former popular president, Teddy Roosevelt and his Bull Moose party and even then Roosevelt lost and wasn't all that close.
I can see why people from Europe, or other places with multi-party systems, might think Bernie should have just run as a third party candidate in 2016 or 2020 but he had zero chance of winning as a third party candidate. Roger Stone realized this even earlier when he and Trump were bandying about taking over Perot's party post 2000 and using that as a platform to get Trump elected but Stone concluded Trump wouldn't have a chance of winning so it's better to take over one of the two main parties. Not voting is simply not going to force the Democrats to "move further to the left".