I don't want to link to the haters but if you've been following this story then you can see my position in the comments. It's one of those times when we don't need a rule book. We need the hate removed and Google does that exceedingly well all over the world with their advertisers and the content it's associated with, as well as full-on state-complicit censoring in China.
I'm all for free speech; like Chomsky I think we don't believe in free speech at all if we don't allow it for people we despise. But it's risen to the top of the search engine rankings and unlike free speech it's lingering in the air forever. So take it down. No rule books, no editorial policy, no censorship. Just remove it.