I think he went way too far in his total rejection of private property but he was very embittered by his own experiences.
He knew that absolute power corrupts absolutely, but that's what Reps are supposedly there for.
Of course he was embittered by his own experience; losers often look to blame others for their failings.
As for what he did or did not know is irrelevant to whether or not he was a fool, what matters is the conclusions he drew from that knowledge.
He advocated an economic system that was simply not workable in the real world without granting the very power he supposedly recognized the threat of to the state.
Now, I have said before, and I will say it again, communism actually DOES work on a very small and limited scale, provided that every member of the society living under it agrees to it. It ceases to work if even a single member of the community does not readily accept it, because it then requires that the de facto state violate that individuals fundamental rights in order to keep the system from collapsing.