"Communism works in theory, but not in practice." Ever hear this? There is an inherent flaw in this logic. Let's say I claim to have a magic ring that makes people want to give me money when I wear it. But, the ring does not work. Was it a good theory? No. I liked the theory, because I was looking forward to the results that the theory promised. But, it was a terrible theory, because there was no good reason to believe that it would make good on the promise. It was mere wishful thinking.