This kind of stuff pops up periodically - rich people asking to be taxed more. Two things I always think of when I see this. First, if you look at these people's tax returns, they typically find every single loophole they can to get out of paying taxes. The 2nd thing I think is, why do you need a law to make you pay more?
It's a classic variant of the prisoner's dilemma. Look it up.
It's the same reason that the US doesn't unilaterally disarm, and that Russia doesn't unilaterally disarm, but if they have a
treaty, the US and Russia can both disarm.
You should be smarter than this. I'm going to guess you aren't a supporter of unilateral disarmament.
The goal is to get *
every* rich person to pay more. If you're Musk, you don't want to pay more *
while* the Koch brothers pay less, because then the Koch Brothers can spend more money on pro-fossil fuel campagins, while Musk has less money to spend on anti-fossil-fuel campaigns. Even if Musk and the Koch Brothers both agree that the government should have more funding, they can't agree to do it unilaterally, because then the other side has an incentive to "betray" --- they need it to happen to everyone ("cooperation").
If
every rich person pays more taxes, they come out even in their battle over global warming, so it's possible for them to agree on this -- but it needs to be mandatory government taxes.
Consider yourself enlightened.
(I studied economic game theory.)