Your co-op works because it's relatively small and (presumably) full of people of like mind. Unfortunately, governments of size will always be corrupted by the one constant in all governing systems: human nature. Communism and international socialism often look good on paper. But in practice their governments are corrupt, non-representative, and tyrannical. They get hijacked by an oligarchy who is in it for themselves only. Which leads to suffering for everyone else. Exactly like what's festered in the USSA.