This is getting interesting.
I could memorize Marx's writings down to the point where I could tell you how many times the letter "P" appears in his books, and it would not change a single element of the history of that movement, and it's unbroken record of destruction.
And your side is supposed to be "reality-based?"
I'm beginning to wonder if I'm on to something about a real cognitive variation in leftist thinking. It isn't clear yet, but it seems to relate to the idea that something OUGHT to be a certain way, so it IS. It would explain a lot of social programs, the tendency to throw solutions at problems that are proven failures, and the complete divorcing of intention and results.