It is a waste of time and energy to argue with, let alone try to convert, Trump supporters. They do not care how stupid, inept or venal he is. He is delivering the goods for them: Tax cuts and gutted regulation for fatcats, charter schools and access to the public trough for pulpit pimps and their superstitious dupes, white supremacy for goobers.
Trying to persuade them as though they were normally ethical and well-intentioned people will only legitimize their scam. Piss on them.
The only way to win is to get out the vote, new voters will vote Democrat.