I like this theory.
Maybe the road to full blown dementia is nearing an end. trump does not see the harm is behavior is doing. An ego so inflated it eclipses all rational behavior. Where oh where are the elected officials that could remove him? Too worried about their own elections on the state level of course.
I doubt he has ever seen what harm he is causing others. His father beat that out of him a long time ago.
To answer your 2nd part this has been predicted decades ago. People who study history and population demographic know full well when a place can no longer support itself. We have passed that point some time ago and yet keep on going. We all should know what happens with Ponzi schemes and the present economic model of constant growth is a huge Ponzi scheme.
Farfetched, but interesting. It would, IMO, explain a few things.