Quite right - that's one of the biggest mistakes people make thinking politically. Socialism and Communism aren't bad because they're ostensibly about sharing, cooperation, or being nice. They're bad because they're run by the government, who arrests or executes its citizens if they decline to participate in the government-run activity. If you've ever shared a refridgerator with multiple people pitching in to fill it with groceries, you've been part of a "commune" (lower case), which can be fine and great thing. It's when people aren't allowed to decline to participate in the commune without being arrested or shot that there's problems.