That is a perplexing question that has puzzled me for some time.
I think that somehow the Chris Matthews and Katie Couric types think that if the entire country could just become a socialist encampment living behind a virtual wall like pre 1990 Berlin, they would get to be part of the Champagne sipping ruling class that enjoys all the pleasures of elitist life in Martha's Vineyard and Jackson Hole.
If the full evolution of their dream ever came true they might be disappointed to learn the like the French collaborators who helped the Nazis they would be disposed of quickly because they have shown they can't be trusted if they would turn own their own country.
Yuri Besmenov has told us that this is exactly what happened to the Useful Idiots who aided the communist cause. They were the very first people shot.