Ah yes, the well known connection between “let’s have a very high tax bracket for billionaires” and “let’s literally go and murder rich people because I don’t like them lol”, you got me. Oh, and sanctioning criminal behavior with prison = psychopathy, got it.
Here’s a good visualization of the wealth the richest people on earth command vs pretty much everyone else: https://mkorostoff.github.io/1-pixel-wealth/
A billion dollars is so incomprehensibly more than anybody needs, no matter the size of their family, that there really is no reason to take these things into account. As for who decides what is enough, it’s the people allowed to vote.
As for the donation example, yes, that is worse, since for every billionaire that miraculously donates some of their wealth, there are loads who don’t. So better tax them all than hope that maybe a couple of them decide to be nice for once.
Of course force may need to be used when people act criminally. In case of tax evasion, that may be seizing the amount owed and/or imprisonment in severe cases.
Say someone steals from a store and the owner demands it back, but the thief says “nu-uh”, what then? Is it morally permissible to use force to get your property back?