Ahh, but we all don't pay taxes, do we. The poor spend from the system but don't put in. The very rich pay at massively reduced rates by using loopholes and lawyers. That leaves the middle class (really any salaried employee basically) as the real taxPAYER in the system.
For us the 50% is conservative. Do the simple math. 39% top rate on income + 8.5% state income (my state) + sales tax (0% in my state) + excise taxes on gas, booze, etc. + capital gains (double taxation) ... 50% is very conservative accounting.
That said, taxes are too high overall, and government needs to be pruned and redirected to provide the important services we all require (I've been really pleased with the military recently-- looks like we've gotten our money's worth there!) But, overstating one's case does nothing to advance it-- I wish more people realized that. All it does is polarize the debate and make everyone look silly.