I guess I should slightly elaborate on what I've said about celebrating a person's death.
There's a flip side to that coin: a person's dying doesn't mean that there's suddenly a period wherein we have to lie and pretend that we liked the person or that we can only focus on the nice things that they said or did.
Back when Jerry Falwell died, Christopher Hitchens got grilled by Sean Hannity for saying that Falwell was a liar and a swindler and that he was glad he was dead.
Really, the idea of attacking people for speaking ill of the dead is just like political correctness; namely, it's to say, "Lie. Say what I want to hear or shut up."
That said, just like when criticizing the living, there's a certain etiquette to it.
Also, just like political correctness, the whole discussion of what you should or shouldn't say about the dead is simply that: it's about what you should and shouldn't say. It's not about how you say it.
So, on one side of the discussion, we have people trying to shut others up. On the other side, we have people who use this as an excuse to be a raging, uncaring asshole and feel virtuous.
I think the right perspective applies to the dead and the living: tell the truth as you see it without needlessly being an asshole.