Paul Tibbets probably killed more innocent people.
Chain of command would actually make it Harry S. Truman or his predecessor, FDR. Blaming an individual for an event only made possible by the work and direction of tens of thousands is a bit of a cheap shot.
I'm personally not dancing in the streets, though I am glad that we finally got Osama. I did get a chuckle out of this newly photoshoped image of an event that took place eight years ago!
The best that I think we can hope for is that this causes a splintering of al Qaeda into smaller and less capable factions due to the power vacuum left by his death and the different agendas of the various groups that make it up and the egos of their various leaders.