He’s a sociopath, no two ways about it. I remember a story his nephew told about bringing his developmentally disabled son (can’t remember the exact condition) to the White House and having multiple meetings with Trump about setting up a bill that would benefit Americans, including his own great-nephew. In one of those meetings, after it had all seemed positive, everyone left the room but Trump and his nephew, to whom Trump immediately said “be a lot easier and less expensive if all these disabled kids would just die”.

Sauce

His ego is his only compass, and he has tied the stock market to his ego. War and Hormuz being closed will hit the stock market. He may well want to back down when that happens, and find himself unable to.