You can argue that no one should be able to accumulate that much because in the wrong hands it's too much power.

But that doesn't mean everyone who has made that much money is evil.

He’s giving away the vast majority of his wealth. He’s the literal embodiment of the opposite of what you’re saying.

Buffet is one of the rare good ones. IIRC he has talked how absurdly little he pays in taxes and that it makes no sense rich pay so little.