Billionaires exist in America because, deep down, the country doesn't want things to be fair. Each citizen (white, anyway) appears to be able to see a yellow brick road to mad prosperity leading from their door and, when that happens for them, they don't want nothin' getting between them and their mansion, cars, party boat, gold bathroom fixtures and #### y'alls. I am amazed how little the internet moguls - whose enterprises were symbolized by workplaces w pingpong tables & espresso machines - caught flack for either using near-slave foreign labor or warehouse workers who can't go to the bathroom when they need to and are then lauded for their charitable endeavors once they've stomped their competition into dust. It's the American Way, wazoo.
I was just watching an old youtube clip of somebody famous, one of the Monty Pythons maybe?, talking about dealing with an 87% tax rate which almost folded him back to scufflin' poor while he was still on the way to reaping the rewards of his efforts. Now, rich folk are almost embarrassed when proven not to be clever enough to pay nothing. I think there's a place in between those two which ultimately profits the individual and the community, but the "science" of economics is too busy being the buttboy of finance to figure what those #s might be. There was a national discussion of this during the Reagan years - what percentage of tax burden stifles incentive but, like with everything else, well-heeled crooks in business & govt ran it straight to zero to see when they'd get caught as the way to find the answer.