I'm not a tax expert, so probably shouldn't get involved here. But....
An example:
Back in the 70's, my dad (an engineer at Boeing) was talking with his brother-in-law(a successful plumber). They started comparing incomes, ect. Turns out my uncle made approx twice(yearly gross, I assume) what my dad did. But he only paid half the taxes. He was able to write off most everything he owned as a buisness expense, plus vacations. He and his wife would take a cruise to some exotic island retreat, meet one of his buisness buddies there, and they'd both get to write it off as a "buisness trip". Hmmm...fair?
I'll consider the top 10% paying their "fair share" if/when we ever get to a flat rate percentage income tax system.