Well, IMO, when revolutions did escalate to violent social and political revolts, the people as a whole felt they were justified in their actions. Take the American Revolution for instance. The people yearned to be free, but the British continued to levy heavier and heavier taxes on the people to subdue them. The people were immensely angered by this, and so they took uip arms to defend themselves against what they saw as a threat to their survival and way of life.
As a result of this revolution, though, the British lost a huge source of raw resources and money.
So I suppose to answer your question as to wheter revolutions are good, that would depend on whether you were the revolter, or the one being revolted against. For the revolters, if they are successful, it results in a better life for them, while those who were revolted against, tend to suffer at least economically.
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