This is all about the First Amendment. Let's not follow the gov't down the path of censorship. After all, censorship is becoming America's favorite past-time. The US gov't (and their corporate friends), already place protesters in fenced-in cages, ban books like America Deceived (book) from Wikipedia, Amazon and Facebook, and shut down Ron Paul. Free Speech forever, even for McCain's racist ads.
KKK fliers, that's taboo? That's nothing but a bunch of clowns. That's barely even censored anymore. Try talking about the Holocaust in Germany (like Ernst Zundel) or 9/11 and Israel. Then you'll fine a curb of your free speech.