I don't think communism is inherently unjust. When practiced in its ideal form by people with no selfish instincts, it could be quite a nice system.
Capitalism is simply a way to harness people's natural selfish motives for the good of society. Neither system is morally superior to the other; it's just that in a state populated by humans, one works a lot better than the other.
Capitalism is simply a way to harness people's natural selfish motives for the good of society. Neither system is morally superior to the other; it's just that in a state populated by humans, one works a lot better than the other.