A better attitude would be to say that billionaires need to share more of their wealth. If you make them pay a let's say 5% wealth tax for having excessive weal

A better attitude would be to say that billionaires need to share more of their wealth. If you make them pay a let's say 5% wealth tax for having excessive wealth, then they're not strongly discouraged from trying to increase their wealth, while everyone else benefits. And in due time they will cease to be billionaires.