Yeah, yeah, and some of the people working at the concentration camps were also against them, they just "went along with it because they had no choice".
Lem compromised with evil, and he allowed his works to be twisted into communist propaganda. That's mega-fail! Everyone was conflicted and anyone can claim to be anti-communist (even the communists, because everyone's idea of communism is irreconcilably different), but it's the actions that count!
In fact, I would hold people like Lem even more responsible for the crimes of fascism / communism than the dumb butchers, because if one dumb butcher goes on strike there are millions of other idiots out there to replace him. It is people like Lem that make evil possible!