It’s funny to me how most of your examples involved the USSR peacefully ceding power. If you’re up against someone with a conscience, sure.

I don’t deny that peaceful movements can be effective (especially when backed with an implicit threat of force). I do deny that they are consistently effective, as proven by Mossadegh and countless similar stories around the world. From The Jakarta Method:

This was another very difficult question I had to ask my interview subjects, especially the leftists from Southeast Asia and Latin America. When we would get to discussing the old debates between peaceful and armed revolution; between hardline Marxism and democratic socialism, I would ask: Who was right?

In Guatemala, was it Arbenz or Che who had the right approach? Or in Indonesia, when Mao warned Aidit that the PKI should arm themselves, and they did not? In Chile, was it the young revolutionaries in the MIR who were right in those college debates, or the more disciplined, moderate Chilean Communist Party?

Most of the people I spoke with who were politically involved back then believed fervently in a nonviolent approach, in gradual, peaceful, democratic change. They often had no love for the systems set up by people like Mao. But they knew that their side had lost the debate, because so many of their friends were dead. They often admitted, without hesitation or pleasure, that the hardliners had been right. Aidit’s unarmed party didn’t survive. Allende’s democratic socialism was not allowed, regardless of the d’etente between the Soviets and Washington.

Looking at it this way, the major losers of the twentieth century were those who believed too sincerely in the existence of a liberal international order, those who trusted too much in democracy, or too much in what the United States said it supported, rather than what it really supported – what the rich countries said, rather than what they did.

That group was annihilated.

Peaceful movements that challenge Western economic interests in regions remote enough for the Western public to not care get massacred. Meanwhile, violent revolutions have provided massive increases in quality of life in many countries, including China, Vietnam, and Cuba. If you want to argue that peaceful methods are more likely to be successful within the imperial core that’s one thing, but if you want to lay it down as though it’s some universal law that violence never works, I’m going to call that out as absurd.