But even then the vision doesn't directly translate to reality as envisioned. How a "fantasy" gets incorporated into the fabric of society is necessarily affected by the reality of how people are: what they believe, and are willing to believe; how they think, and have the capacity to think; what they want, and how far they are willing to modify what they want; what they fear, and what fears they are willing to abandon.....Every movement that carries us forward into coming history is founded on some "fantasy world" idea that caught on and spread through the population over time until it was incorporated into the fabric of our society....
Every vision of a brave, new world is changed by the implementation of the vision (Schrödinger's cat). The Soviet Union was not by any means the workers' paradise envisioned in the Marxist-Leninist fantasy. It could not possibly have been, because the realization of the fantasy was necessarily affected by the fundamental natures of humans.