I’m not American so have given up trying to understand the actions of a mad man.
The issue is not that it's the action of one mad man.
The dude has been elected by a lot of people thinking that his ideas were the way to go. To me that's the real issue. Trump himself could vanish he would as quickly be replaced by some variant with very similar ideas... And that wouldn't change much (save maybe that this other person would be less orange and less illiterate? Maybe)
CoughVanceCough. He is bright & very smart, powerful, and young. His Munich speech for example, even though too many of my EU fellow citizens (and representatives as well) dismissed it as non-sense and mean, was quite articulated (very hypocritical too, but that's not the point) and, well, quite informative on what the USA want to do and what the USA will do.
And so is Bessent, in a less rhetorician way even though I don't imagine him becoming a leader but that's just my gut feeling ;)