I don't know what to say besides that I disagree with almost every single aspect of what you wrote, on either a factual or a moral basis. Often both. Honestly though, we're so far off that I think itemizing everything I disagree with here would be a waste of time. So instead, I'll list what I do agree with. First to answer your question, I don't believe most Trump supporters are racist, although I would suggest you really analyze why decreasing linguistic or religious dominance is threatening to you. I agree that the first (but not only) duty of any world leader is to the people of their country. I agree that cutting regulations, cutting taxes, and encouraging low interest rates likely helped the economy (although other effects of some of those regulatory cuts, especially on climate, are very concerning to me).

And to answer your final question, the most recent example of Trump not caring about the damage he does is him currently undermining faith in the democratic process itself in order to avoid admitting defeat. More generally, he will always take opportunities to fire up his base despite any deleterious effects on national unity. And yes, also his actions and rhetoric toward strong allies such as Canada. Framing such as "parasitic countries" is both inaccurate and diplomatically unproductive - from you, but especially from a world leader. I would go further into why I disagree with that approach, but that would lead me into all the things I disagree with here. So instead I'll just ask you to do some research on your other points outside of right-wing sources. The most clear-cut one is this thing about Pelosi's son, so maybe start there.