Oh didn't you hear? Communism works perfectly, just whenever it's tried it devolves immediately into an autocratic mess with a collapsed economy. Then all the theoretical commies that enjoy life in a capitalist country all say in unison "That's not real communism, real communism has never been accomplished". Somehow that's an argument for trying the thing that always ends in disaster when tried. Having a house built on a cloud would be real cool, but trying to build your house on a cloud just ends predictably bad. You can't just write off your house falling to the ground because of how cool it would be if it was possible.