Well, questioning if Lenin was a good person or not has little to do with established facts and more to do with one's already-held political and moral beliefs. So a contrary opinion on that is something I could strongly oppose (even venomously if this was 2010), but it's not something I find to be offensive and distasteful in and of itself. Contrary to this, there's just stupid myths that people repeat, perhaps maliciously. Formaldehyde claimed that Catholics caused the Holocaust; he denied that he said it, even while I was quoting his own post to him, and his defense was mainly accusing me of poisoning his character (though he did also quote some articles on the matter to get away from that, which I responded to in kind). I'm willing to forgive all of that with the promise that it doesn't happen again.