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Those are all good points. I should say that I don't really believe in "greedy people," or more broadly, I don't believe that people have stable personalities that can be described in that sort of way. I was talking about greed as a, let's say, institution.

That said, I was talking about revolution specifically as a failure state of unbounded greed. It has been bad enough for that in the past, and revolutions have been successful at deposing governments, even if they don't always produce the best follow-on state. The postwar era has generally seen western governments be successful at economic stability, but that's becoming less true over time. That said, there are some vestiges of economic control still in effect (that is, "stabilizers" like unemployment and Social Security) that stopped the global financial crisis from getting unbearably bad. But keep in mind, the last time we saw overthrows of major western governments was the Great Depression, so the more economic policy looks like the conceits pre-Keynes "Classicals," the less your moderating arguments work out.