almost every government claims to pursue some species of 'utopia' or idyll
in practice, that's not really the case. while 'communism' under stalin was destructive and incompetent, it wasn't because stalin was too benign.
Not every government and depends also what kind of utopia. Every left wing system is more or less an utopia that sooner or later needs to go bankrupt and cause an economic disaster. Stalin had to open Russia for technology from bad Western capitalist states because alone he wouldn't build shit there, and it was still doomed to fail from the beginning, not because of Stalin, but the flawed system itself.
this doesn't mean anything.
it's like saying that nationalism denies that man is greedy by nature, because nationalism wants people to unite around the nation-state. however, it just so happens that people sacrifice themselves for nation and religion constantly throughout history. most people identify with communities and conform, they aren't just 'greedy,' whatever that means
abstract concepts like 'human nature is greedy' didn't interest marx, for instance, who wanted to get away from meaningless abstractions to describe actual existence
It depends on what kind of environment we are talking about in which you have been
brought up.
If we revert civilization back to some pre-cultural barbarism-nomadism era and bring humanity back to the trees, free them from oppressive culture (even if they don't want to be freed lol), and leave them at the animal level, which Marx wanted, then communism could work and we will own nothing and be happy.
But if we talk about building a highly developed civilization, there needs to be inequality because every person has different IQ and abilities, there need to be classes, people need to exploit each other, have to compete with each other, greediness and selfishness need to be rewarded. And this will be a natural behavior within this environement. Only this 'natural' exploiting, greediness etc need to be regulated, and that's where religion, morality and ethics come.
the early marxists didn't claim that communism was opposed to self-interest. if anything, they suggested that capitalism is a system where all people serve the self-interest of a small minority, and that communism represents the self-interest of the masses
Yea that's why communism failed in the West initially, workers refused following the communists and 'betrayed' the revolution, so you had to switch your proletariate to faggotry and foids, to free them from 'oppressive' culture.