They believe in Communism, that it will save and provide a fair and happy existence for them. But they are not Communists themselves because it requires effort. They want to be ruled by Communists.
Also they are completely blind to the horrors of Communism. They cannot see past the idea of a utopia. They are utilitarians, they believe in the greater good regardless of how to get there. They 100% that they themselves will only benefit and not suffer as a result.