Because after fed taxes the states are left with a stone they can't squeeze blood from or at least not without pissing people off. Secondly, there's a tradeoff

Because after fed taxes the states are left with a stone they can't squeeze blood from or at least not without pissing people off. Secondly, there's a tradeoff here. If you take something out of the purview of the feds so that your state can do it "right" you lose the ability to force Alabama or West Virginia or whatever to do it your way.