The error that you are making is that when we are looking at ideology and evaluation if it could help to improve the world. With Communism there are massive am

The error that you are making is that when we are looking at ideology and evaluation if it could help to improve the world. With Communism there are massive amounts of problems, but a major one is how to think of the transition, and how to enact the transition. The USSR had to be a dictatorship because otherwise they and everybody who thinks about it for 5 min understand that the transition to communism will simply not happen. So if you have a ideology that practically unreachable then that is a massive problem for that ideology and its ability to actually improve the world. The very extreme proposition dictated by communism forces the people who follow the ideology into extreme actions.