It doesn't have to serve a useful purpose. We don't have the first ammendment here.
As a Jew who has family members killed in the holocaust there is no need to give me an allegorical story. I still support the right for people to be offensive. Just don't be surprised when that offense becomes intimidation that I will fight back and good people who know what that feels like join in and help. When fascists flying the Nazi flag want to burn the Talmud then I am not going to fuel that fire by making them feel that they are being persecuted and that I am the one trying to censor other people.