In France, the Revolution didn’t lead to better government, just different government and different despots. Same is true for the Russian Revolution. The American Revolution still maintained slavery. And the Islamic Revolution enforced laws of repression and discrimination. I am sure that there are instances when the oppressed once freed did not mimic their oppressors. But, since I am not a student of history, I can’t think of one off-hand. Those overthrown deserved their fate, but the populaces affected deserved better post-revolutionary leaders and governments.