No, it is impossible to make such an assessment. What I'm saying is that if the government did not exist, the 10th man would have only a minor fraction of what he has with the government. People who benefit the most should pay the most.
What if the government were 10% of its current size. How much would he have then?
The issue at hand is the rampant growth of government and the welfare state. Democrats always make the argument that without government the rich wouldn't be rich, but that is a false dichotomy. The argument isn't that government should be abolished - it's that it has grown far too large, consuming far too great a slice of the GDP.