Again, you rely on the utterly false notion of a "zero-sum" economy, when in fact it may only be possible to pull everyone out of poverty if we allow people to be proportionately rewarded for their contributions.
That _may_ be true (though the fact that we _have long_ allowed them such rewards and they certainly have not pulled everyone out of poverty seems to auger against that hypothesis) until you prove that conclusively, however, we should continue to proportionally tax them on their earnings.