The power law you are describing happens in nature too. Size of trees in forest, mass of stars, ect. You can't go deep enough to dig up it's source, so you get

The power law you are describing happens in nature too. Size of trees in forest, mass of stars, ect. You can't go deep enough to dig up it's source, so you get carte blanch freedom to make the distribution arguments however you want. But until you dig up the cause for why the system produces a power law output for wealth distribution that has happened pretty much throughout history, under monarchies or capitalism or whatever, then you're just shuffling deck chairs on a titanic argument.