Go watch some documentsaries about USSR, north korea, khmer rouge, and china then talk. USSR collapsed, Khmer rogue executed 1/4 of its’s population and north korea is a nation of brainwashesd people thinking their leader doesn’t poop (I don’t know enough to talk about China, but they have an economy)
Khmer Rouge was backed by the US and was lead by fascists who rejected Marx, like the Nazis.
The USSR and China both drastically improved metrics like life expectancy, literacy rates, reduced poverty, eliminated famine, and generally uplifted the poor when compared with Fuedal Russia and Nationalist China. They had numerous issues and tragedies, yes, but overall did very well for its people.
Please find a genuine source saying that North Koreans don’t think their leader poops. Or, just watch a video of some Aussies going to North Korea to get a haircut. North Korea is certainly no paradise, but it’s also one of the most propagandized against in the western world.
To be fair, those failed because capitalists took charge claiming to be socialists. Not saying there is a surefire way to prevent that from happening every time.
That hasn’t happend, historically. Unless you mean the Khmer Rouge, but that was more fascist than anything else, and the leadership explicitly rejected Marx.