It doesn’t matter if he doesn’t “need” it. He paid into it, involuntarily, all his life. At the risk of imprisonment if he didn’t pay his taxes.
We don’t get to steal from people because they have done well. Most do well because they work hard, stay off dope, are honest, are innovative, have self discipline, keep the law, and treat people decently.
You forgot to factor in a bit of luck which many if not most of the wealthy had. If you think most of the wealthy earned it all by the sweat of their brow and busted their azz 24/7 you probably don’t know very many wealthy people. I find it amusing on here with people citing certain principles (like they earned it and thus entitled to it) while some of these same people excoriate Libertarians like Rand Paul and Thomas Massie for doing the same thing when it comes to matters of principles. You sometimes have to weigh the practical against the ideal.