Why do so many people vote for him? That's the more important, interesting and difficult question.
Not just him of course. Milei, Bolsonaro. It seems like an act of self harm to vote for people like them who will work against your interests, yet people do it in their tens of millions.
The reason people flock to a right-wing populist like Trump who clearly doesn't give a shit about them is a bit baffling. There's another thread on that but I'm not sure I'm totally near the answer.