the depiction that he has a very short attention span, can't think strategically etc. fits the observable evidence.
So, even though it might appear that he's planning to bring the US to its knees in order to stay in power, I doubt that's the case.
But he's feral and opportunistic.
SCOTUS is kind of a warning bell. It all comes down to how people will assess the personal risks associated with bending to his will.