We all share a primary goal when we work; to make more money.
But if you had to split it equally with everyone else, and you could see some lazy people not working but getting as much as you, would you still work? Most of us would slack off or quit as our sense of justice was offended. Even monkeys in science experiments show outrage at this.
So then how would you, as the new ruling class, get the working class, to work again?
Well first you would remind them of civic duties and responsibilities.
When that fails, you would plead.
When that fails, you would threaten.
When that fails, you would make violent examples.
Thus socialism is inherently unstable and collapses into dictatorships.