The very tip of the capitalist ponzi scheme... has 8 people standing on it, and the only thing which will flatten that pyramid is high taxes, anything else is window dressing
"Capitalism" always the fall guy.. problem is what we have now is far from "free market capitalism" ... what we have now is more properly termed corporatism.. the deck is heavily stacked against the small businessman and heavily in favor of the megacorporations..
The inequalities that have increased in the US are not created due to lack of taxation of the elite (a factor but not everything) but rather due to "too big to fail", corrupt lobbying .., government in bed with megacorporations.. fed policy at ZIRP which allowed megacorporations to merge like crazy on loads of cheap debt.. right now many mega corporation businessman are trying to buddy buddy up with trump so they can hopefully get favors down the road etc...
You can tax all you want.. as we move further away from free market capitalism and towards globalistic corporatism where the biggest guys get the biggest favors from global goverements/central banking policy.. global inequalities will continue to expand.. and thus increase instability as well..
societies with a strong middle class function the best and the best way to achieve that is via free market capitalism where everybody is treated equally..