As I understand it, the usual liberal and progressive point of view is that there are certain immoral and greedy individuals at the pinnacle of capitalist society and that if these people are done away with (or persuaded of the error of their ways), everything will be hunky-dory. This is a deeply unsatisfying explanation, particularly to anyone steeped in Marxist thought. That we have the specific structure that we endure on a daily basis should itself give us pause. I contend that it is the "default structure" of our times, given our technological modernity and the concomitant stage of history we are presently at.
This is not to say that we should not struggle. We should. But this notion of "default structure" does, however, suggest two important caveats. The first is that we need to have an alternative very clearly delineated. The road to hell is paved with good intentions. We don't want the fiasco of Orwell's "Animal Farm." Or in other words, without a very clear and detailed idea of where we want to go, we will unknowingly replicate the "default structure." The second caveat -- closely related to the first -- is that this default structure exerts a magnetic pull; in scientific lingo, it's a point of "stable equilibrium," towards which any artificial system -- even if carefully designed -- will naturally gravitate.
This mix of finance capitalism, plutocracy, sham democracy, militarism, a global economic web controlled by a hegemon, growing disparities between rich and poor, both globally and in nation states, deteriorating biosphere -- this is our present structure. Whether revolutionary force can change this set-up at a fundamental level, and transform it root and branch, is an open philosophical question.