Yeah, I'm sure there are all kinds of ways to get the rich to pay more of their share. The big question is, why do people need to be so rich? If I had even $1 billion, let alone $400 billion Elon had before Tesla nosedived, I wouldn't know what to do with it except give it away. I couldn't possibly spend it on myself, wouldn't need to leave that much to my kids. If I had as little as, oh, a few million, I'd feel secure enough that I'd never have to think about it again. If I had more than that, I wouldn't sleep at night knowing how many people were suffering, starving, homeless, etc.
I think people like Elon and Trump see it as a game, a show of power that's ultimately as meaningless as winning at Monopoly.