Originally Posted by Cherry7

Karl Marx wrote nothing about communism, so how could he be wrong about it?

He believed that new societies and their economic structures grew out of the previous society.

To plan a society in abstract he called Utopian.

The forces to change feudalism grew up under it, the the merchants, which became the new capitalist class, and changed society into what they wanted. Pushing aside the aristocracy.

Marx believed the working class would be the agent of change to a new society based on social need and not private greed. He never said how this society would look.