Everything you state is true and well-argued, but I think the problem goes back much further than Capitalism.
The financial elites that prey upon others through today's version of Shock Doctrine Capitalism are largely heirs of old money; and that old money became concentrated into a small percentage of hands centuries ago.
The various monarchies that ruled in Europe held enormous wealth inside small family circles, and the same became true in America. The present Bush and Clinton family legacies suggest a case in point. (Add in any number of names from the Forbes' billionaire's club... starting with Pete Peterson, the Koch Brothers, the Walton heirs and you notice where a good deal of national, and these days, global POLICY gets made.)
The Vatican, one of the richest institutions in the world accumulated its massive wealth by bribing churchgoers into thinking they could pay for Spiritual Salvation. How often was it that churches gilded in gold left starving parishioners outside to fend for themselves? How many policies of servitude, slavery, and punishing pogroms did the church sponsor?
Wealthy families dominate the political landscape throughout Latin and South America, too. And these families joined hands with corporate overlords to see their own lands raped (and peasant peoples suppressed)... for personal gain. John Perkins explains that these same protocols STILL exist.
The Saudi royals do their arms deals and turn the weapons on any protesters so bold as to challenge their hegemonic controls.
My point is that capitalism came later to the story; and while wishing to fight it is a noble cause, generally until a problem is recognized from its roots (rather than what's apparent from a surface level), it will find a way to grow back... like the Cancer that it is.
No society can allow for immense wealth concentration. A threshold should be reached at which time, anything over that fiscal limit recycles back to The People and/or The Commons.