I'm not sure what you are trying to accomplish here. Venting? I get it; today's political climate is frustrating and I don't think many in the country want Trump v. Biden: The Rematch.
But if you're attempting to persuade people on the board, while I wish you well, I would caution you against referring to Trump as "sub-human." He is not, and that is dangerous language. Trump is human, all too human. Using that language will automatically turn off many of the people you might be trying to reach with the rest of your message.
As for how millions will vote for Trump (or Biden, for that matter), I suggest you read
Democracy for Realists. It's theory explains this phenomenon pretty well, I think--even though I fall into the trap of thinking voters are rationally thinking about all these issues and are involved in a complex calculus to determine who to vote for all the time, as your question implies:
"Democracy for Realists assails the romantic folk-theory at the heart of contemporary thinking about democratic politics and government, and offers a provocative alternative view grounded in the actual human nature of democratic citizens. . . .
[The authors] demonstrate that voters—even those who are well informed and politically engaged—mostly choose parties and candidates on the basis of social identities and partisan loyalties, not political issues. They also show that voters adjust their policy views and even their perceptions of basic matters of fact to match those loyalties. When parties are roughly evenly matched, elections often turn on irrelevant or misleading considerations such as economic spurts or downturns beyond the incumbents’ control; the outcomes are essentially random. Thus, voters do not control the course of public policy, even indirectly."
Why our belief in government by the people is unrealistic—and what we can do about it
press.princeton.edu