I'm with the "death isn't sacred" crowd on this. Saying that we should treat people with more respect or whatever once they're dead just seems so arbitrary. Why do it? You can't roll out the "death is an unknown" or "every life is sacred" arguments without assuming that religion is right, which makes any argument pointless. Death is just one more natural process. Celebrating the death of a particularly evil person shouldn't carry any particular taboo around it. In pure practical terms, he was a bastard, he did terrible things, and him being dead means he can't do them anymore. That seems like a decent reason to celebrate to me.
With that said, anybody celebrating because "the war was worth it" or because they think we accomplished our objective hasn't really been paying attention for the last nine years. Did we want the guy? Sure. Are we going to do anything different because we got him? Not a chance. Nobody is coming home because of this, and the jobs we have to do in Iraq and Afghanistan aren't done yet. This stopped being about taking out a bunch of terrorists on playing cards a long time ago. Hell, it probably won't even affect the drone program in Pakistan.
So now I wonder, are we finally acknowledging our presence in Pakistan? Seems a bit weird to admit that we're conducting on-the-ground military operations and not admit that we've been blowing people up with drones for a few years, especially when everyone already knows we're doing it. Also, I have to wonder if it really wasn't possible to take him alive. With all political trouble capturing him would have caused, I have to wonder if he wasn't, at least in part, killed because it'd be more convenient than taking him back for trial.
That's become a question I find myself asking all to often these days - indeed, the entire drone program seems designed around the notion that we'd rather just blow them up than capture them. I don't mourn the individuals, but not even making an effort to capture them when they could have valuable intelligence indicates that we're letting political concerns for convenience dictate policy in this matter. When killing is done for convenience, I do start to worry. But anyway, yeah, celebrate all you want, so long as you know we ain't done over there.