Are you saying communism cannot exist separately from (evil) dictator? Lots of the ideas do (there are plenty of functioning highly socialist countries). Theoretically at least communism could exist peacefully (although it seems you would need everyone in the country to agree and remain agreed to the principals for that to work).
Also - dictatorships can work. There have been several 'benevolent' dictators who made communism work without introducing any more evil than many democratically elected leaders. A dictatorship doesn't naturally lead to Mao/Stalin etc.