I am impressed that you know so much about what President Trump is doing. Except you don't.
Nor do you know why President Trump likes Ambassador Bolton. I have some thoughts on Bolton. He has specific views on a wide variety of foreign policy areas. I heard someone say, last month, that Bolton has a bushy mustache and sharp elbows. He knows how to fight and win against entrenched anti-Trump bureaucracies. Bolton will ensure Trump hears a range of different views and options for any given issue. Once President Trump has decided Bolton will push bureaucrats until the missions are accomplished.