If you think the Federal government has authority to tax a trade of your labor for money, you're a retard.
If the federal government arbitrarily set the "income" tax regulations to tax 100% of "income" for everyone, I'd bet that 10/10 "constitutional conservatives" would be all riled up and yelling: They can't do that! It's unconstitutional!
But they instead set the percentage a tad lower and all the conservative sheep are placated and docile while the retard liberals bleat in the background.