The line is always there though, and the question is who is doing the pushing, and who will it benefit when it happens. Revolutions have always typically exploited the poorer more uneducated members of the society to overthrow the so called ruling class, only to have a new one put in its place that is just as bad or worse then the last one. It is almost always motivated from a mid group that has capital (money, land, power) and wants to expand its power base and take over.
Sure sometimes revolution has actually benefited the people as a whole, but rarely so, and even still, that middle group gained its own ends in the process.
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