You haven't lived in the USSR or in the Eastern Bloc, have you? So far, there wasn't a way of living invented where there were no abused and/or abusers.
Note that I don't disagree with your notion that abuse is abundant in all human societies.
If you assume that abuse can be caused or influenced by more than one thing -- which I believe makes sense but you might disagree -- then it doesn't matter what communism was doing if we're talking about capitalism.