It's very satisfying to complain about a problem if there is no actual solution. It is an awful feeling when you're just complaining instead of trying to fix things. The existence of someone out there actually trying to fix problems you are just complaining about makes people feel really bad about themselves. So libs have to badmouth socialists at every opportunity so they can still insist their inane complaints are the height of morality and that doing anything about a problem is actually "less moral" than just complaining about it.