I mean someone who goes and sees and still thinks they can comprehend.
Truth of the matter, as much as I want to go, I can't. I'm a Kohen. All my information is what I heard from my grandparents, (one of who is still alive, may she live till 120 in full health and strength).
So I cannot say anything about what one thinks after visiting, but (and not even going to the Holocaust denial extreme now) there are those who really try to downplay the whole thing.