Well, people would not want to pay more, so free solidarity can not work. The net result will be higher taxes, of course. The question is whether these costs are worth it or not, but not the "let people do what they want" as that won't work - see how US billionaires don't really give up their wealth voluntarily. And now, building a foundation is just an excuse to not give the money to the people. It is for their protection of wealth, not for solidarity.