What was so hateful about the quote from Hitler?

Hitler was the enemy of humankind. Any public quotation of his words can potentially and eventually do the harm to the humankind. You are the one, who is under influence of such an action. You already ask such a questions. If someone says, uncle Adi wasn't totally wrong, you say nothing, right? Then they say, maybe uncle Adi is comparable to uncle Joe? You smirk and do your choice - maybe, right... You don't know that. Then that one with the tail and sulfur-smell tells you, uncle Joe was the bad guy, and bad Bolsheviks kill the talented painter from Vienna, that just make his private life with Eve Br. And then, you suddenly go to the Auschwitz, and nobody can help you out.