When you have so much money that nobody else matters to you and you become the only character in your story.

He's the hero in his own mind, in the sense of: "I'm burning down society to the ground to rebuild it better for all! Can't people see that?! Don't they realize what I'm trying to do for them!!!" Of course he doesn't have enough awareness to realize people can't see that through the smoke and flames of everything burning around them.

sycophants. The answer is sycophants. Always being told you're right messes up your brain.

He's playing stupid to convince his base they're the resistance

Because media illiteracy is almost a prerequisite for being far right wing

It's actually a great example of the difference between movies and reality. In most movies the evil people "know" that they are evil, they want to be evil. In reality evil mostly comes from people thinking they are doing the "right" thing, which has to be done, while ignoring their empathy or being incapable of empathy.