A canard I used to hear a lot from Murkans is that the American "Revolution" didn't end in a messy dictatorship because he revolution itself was rather placid. Armies were relatively civilized (despite the Murkans bringing in several innovations that would had the British calling them terrorists if the word already existed lel), and the scale of the battles was minuscule. Materially, it was more of a jamboree than a revolution. Only a little later the French showed the world how you make a real revolution, and that and the ensuing wars reinforce the canard about the American revolution.
I think it's a bit too simplistic, but there might be some philosophy worth developing there. Logically, if you create a system that rewards amorality and ruthlessness, you shouldn't be surprised if it becomes stuffed with psychopaths. A brutal system favors brutal men. The best example being Stalin's communist party. Lenin created a big authoritarian framework arguably for winning the revolution, and so the legend goes, he would dismantle it later. Stalin took it and really put it to good use. As we all know, he imprinted his personality on the party, and built his power base by promoting merciless but craven men, little copies of himself minus his balls. With a party-government like that, it was inevitable that the Soviet experiment wouldn't be what it should have been.
So then, a desperate and violent situation would generate a desperate and violent revolution would generate a desperate and violent society. Again, seems simplistic, but also seems to make sense. Socialist revolutions seem to rely on times of utter catastrophe in order to be born or succeed, i.e. WW1, WW2, so it's possible that socialist revolutions are doomed to beget authoritarian States.
inb4 you can't judge Stalin, he had to fight Hitler etc.
If there is an independent, anti-establishment leftist faction, the State will ally with the far right.
Has any such neo-revolution ever happened?
Yemen is a utterly miserable country that barely had a government to begin with. If it wasn't this, they would have found another reason to keep a long, dragging war going. It's a whole different scenario from developing or developed countries.