The impeachments and conviction were perceived by his voters, rightly or wrongly, as cheap political acts done by a corrupt administration. And his opponent, elected in the primaries, was pulled away for actual dementia. If you want to win people over, this is the exact opposite of the way to do it.

That's like insulting millions of people. I don't think it's that. Trump has to have some appeal that rest of the world is missing. It's not possible to win otherwise.