> Considering that the top 1% of taxpayers pay more in income taxes than the bottom 90% combined I would say the rich are already taxed.

There are multiple errors of omission in the above statement, I won't address all of them, but the easiest to understand (but unfortunately the least informative) is this:

Individual income taxes provide only 49% of all tax revenue, so you are arguing only about a minority portion of all federal tax revenue. Another 3% come from corporate income taxes. Yeap, that's right, only 3%!

The rest come almost exclusively from Social Security and Medicare taxes and there, the top 1% provide about 1% because their contributions are capped at a very low level.

That omission alone makes your statement look like an attempt to deceive by hiding half of the real numbers.