Yes, ultimately the problem are pesky humans ! :-)

Precisely what the followers of Marx and lening have discovered in their quest to build Communism, the workers' paradise !

They've discovered that humans are cheating weasels who, if an avenue for abuse is left open, will use it to perform abuse !

They discovered that humans do not in any reliable way "give according to their ability and take according to their needs" but rather tend to "give as little as they can get away with and take as much as they can get away with".

"Sad but true" (c) Metallica 1991