

The US just does not have the power to take on its allies and the rest of the world in open aggression. Any thought that it does is illusory, look at relatively small countries like Vietnam and Afghanistan where it just had to leave or the terrible mess of the Middle East. It can not colonise in the way it was possible to do 200 years ago, the power asymmetry is just not there. Added into that many of the targeted countries are nuclear powers and part of numerous combined defense treaties. Any real action he takes will be visited back on him in equal or larger measure. At some level the US if not Trump must instinctively understand this, it is the past rational for proxy over direct wars.
This derives from a fundamental misunderstanding of why people play games.