Focusing on a single tax is silly. We should look at all taxes paid across all levels of government. Federal income tax is one of the most progressive taxes out there, so of course that's what people focus on when they want to make the point that wealthy people are being sacrificed to the altar of taxation.

If you look at all taxes, the share paid is remarkably close to the share earned. According to https://itep.org/who-pays-taxes-in-america-in-2024/, in 2024, the top 1% earned 20.1% of income while paying 23.9% of taxes. The bottom 20% paid 1.5% of taxes while earning 2.6% of income.

This seems to show the same gradation but with less magnitude. Was there some other point you were making?