I see the difference, I just it's trivial when you look at the aftermath. Both sides are celebrating the end of human life, both for their own reasons. While Bin Laden's death signifies the end of the search for the mastermind behind 9/11, how many innocent victims died as a result on both sides? Does extracting revenge and "justice" take precedence and allow us to retaliate equally against the same actions we deemed deplorable? Again, to a certain extent I get the justification behind our actions, yet that doesn't change what they are in essence. Just the hypocrisy of it all, and given how many innocent had to die on both sides to lead to this result and just how primitive it all seems to do so prevents me from viewing this as some truly joyous occasion. It all boils down the celebration of death.
If stripped of all variables and perspectives, both sides used extreme measures to leave a lasting impression on the opposite side.