How could the guy have written a book - a whole series of books - about not taking the map for the territory, about E-Prime, about the importance of the scientific method, defending sheer loonies like Velikovsky and the freak who wrote The Bell Curve, about being skeptical about everything, including skepticism... and then turn around and blithely say that "Karl Marx's theories have failed", without naming a single theory of Marx's or how it had been shown to have failed? Is historical materialism at fault? The labour theory of value? The belief that the industrial workers are the revolutionary class? Which one?
The followers of Marx have often been Stalinist fucktards, certainly, but so (RAW noted) are the followers of Wilhelm Reich, and I didn't read "Reich's theories have failed". But I suppose the prejudices which underly our own treasured place in the world are the hardest to see through, even if you think you've progressed mostly past Cosmic Schmuckhood - virtually every American heterodox thinker got wet and gooey when Stalinism fell over because "their side" had won in the Cold War. Fish can't really help feeling horny when the water temperature goes up.
Not that I want to speak ill of the dead - and I still credit Pope Bob with a major part of my psychic evolution - but little blindspots are often more infuriating in the brilliant than in the mythical average Jo(e).