Taxes are more than just a revenue source, they also change people’s bahavor. So, donating money to the government and raising taxes results in different outcomes. I don’t think the US government needs more money, but the current tax structure distorts the economy and creates inefficiency.

Longer term, having the rich pay little taxes destabilizes the nation. Democratic rule is not perticularly stable over time and the US is heading down a very dark path.

In the end their are not enough billionaires where revenue from them really matters. Higher taxes on competent wealthy people has little real impact. However, ultra low capital gains is crital for creating a group of people who are incompetent, inherited lots of money, and stay powerful.