I second @mattbrowne comments and find it disturbing that there should be celebrations akin to football rallies in the streets. I am glad that the symbol of hatred, repression, and death is gone but am disturbed by the celebrations. They are eerily like the one seen in some backward middle-eastern countries when the Twin Towers were destroyed.
Rather than celebrate we should be looking for the reason that person became an international hero in some places. Remember bin Laden, like Qaddafi started out as a hero stamping out repression. You have to ask yourself how freedom fighters become oppressors, dictators, and terrorists. This says something very bad about human psychology and the fact that we have not evolved very far from our primitive tribal heritage.
Revenge begets revenge in a never ending cycle. Our only hope is that al Qaeda can elevate itself to resist revenge. That is not likely so I expect an expansion in “the war on terror” as futher revenge for near future acts of violence.