He keeps going because of our support. We have to keep letting him know that we still support him.
I was afraid that he would be neutralized by Stockholm syndrome once he entered the toxic swamp, the way that so many of our good conservative leaders are brought down once they go to DC. But President Trump has so far resisted. We help him resist by communicating our support.
It took him a bit but now the president understands the left better than any of us now. He has gotten both barrels - I suspect he is like me - pissed