In the first two years of Truman’s administration he won a world war, implemented the Marshall Plan to keep Europe from starving, did the Berlin Airlift to keep the Soviets from overrunning Germany, founded the UN, and reintegrated tens of thousands of returning soldiers back into a roaring US economy.
I've given up trying to give some justification to his behavior by applying psychological terms. He's just a common everyday fucking moron. Hence his appeal to his base.
Just keep watching that idiot box Donnie. One of the very mediums he wants to control is controlling him and making him more and more irrational and unpredictable. Then he turns on FOX to be given his daily political agenda. This is what happens when you are a vacuous piece of shit that stands for nothing except the adoration, glorification and love of oneself.