Even though he is smart, he himself admitted more than several times at his rallies, how he never knew how deep and treacherous the swamp was going to be. He was not only fighting the Washington establishment, but worldwide globalist entities as well.
1) Trump isn't smart.
2) If he had a bad relationship with Washington, that was on him. The problem wasn't just his mistreatment of the professionals who run our government, it was that he couldn't even work with the people HE appointed to get things done.
3) No one takes you seriously when you say "worldwide globalist entities"... that's pretty much in Lizard People territory of conspiracy nuts. We live in a global world. That's our reality. It's actually a GOOD thing. A globalist world means more access to goods and services and less wars. How is this bad again?