While I agree with you on the opinion that capital gains taxes are low (I should not be paying less on my winnings from bets on the stock market than I am on the income from my work). I think you need to justify the opinion that income taxes are high.

Personal income taxes are the larges revenue source for the U.S. Government, so it is the main way we have decided to tax ourselves. Arguably it is one of the most steerable, and we have long health that progressive taxation is for the common good (as much of a mockery as some high-income individuals have made of that).

So with that as the background, the U.S. ranks towards the bottom of the OCED countries in taxes vs. GDP. Yes we get less than the citizens of the countries paying the most, but not that much less.

https://taxpolicycenter.org/briefing-book/how-do-us-taxes-co...