The only person he cares about will soon die. He hates with a passion those who oppose him. He contemns those who love him. He wants his legacy not to be "the best", but "the most powerful". Against this back drop, every single one of his actions totally makes sense.
He goes out of his way to deliberately destroy everything "the libs" value and stand for (nature/protected species/national parks, social safety nets, science, education, international relations, equality, climate action, clean water, healthy food, absolutely everything). He won't be around to suffer any of the consequences and doesn't care about anyone who will. Which makes him exceptionally dangerous. He especially couldn't care less about hurting his supporters; he, in fact, laughs about how pathetic they are ("smart people don't like me"...yes, I called you dumb).
Every one of his actions is based on pitiful vengeance and extreme narcissistic delusions of grandeur. About hurting others (malignant narcissism), and about permanently imprinting himself onto everything America (the WH, the dollar, the NP passes, and much more to come.... watch him carve himself into Mount Rushmore - not even a joke). Both, out of spite and because he wants to force the world to forever remember him. He wants to be feared like God and worshipped like Jesus.
He is absolutely the worst possible person to be given this much power. Much much worse than any of the world's worst current leaders, by far.
He MUST be stopped.