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