You say that because you know that you don't have to pay 90% of their income. I have no desire to pay even 45%. And if you're generous you can volunteer to pay 90% of their income to charity. There are no cops.
90% tax rate is insane. If that much tax is levied, then what will be left with the individual? Reminds me of the insane rates which were prevalent in India during the 1970s and the 1980s.