You're insisting on shifting framing to percentage of tax collected. That's irrelevant to the fairness question of percentage of income paid as taxes. The insane imbalance where the rich end up paying half of all taxes while simultaneously paying a fraction of their proportional wealth in taxes only highlights the massive difference in personal wealth. Taxing that at a higher rate only seems unfair if you take the view that all wealth is earned fairly and any attempt at altering the market's allocation of wealth is against the natural order.