Do not ask for whom the bell tolls. It tolls for thee. --John Donne

It always takes me longer to process my feelings that most others. Even now I really don't have any of my own words. However this collection sums up my feelings rather well.
The Psychology of Revenge: Why We Should Stop Celebrating Osama Bin Laden's Death
A great quote:
"I mourn the loss of thousands of precious lives, but I will not rejoice in the death of one, not even an enemy. Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars. Darkness cannot drive out darkness: only light can do that. Hate cannot drive out hate: only love can do that." - Martin Luther King, Jr."
Proverbs 24:17-18 (NKJV)

 17 nDo not rejoice when your enemy falls,

And do not let your heart be glad when he stumbles;

 18 Lest the Lord see it, and 3it displease Him,

And He turn away His wrath from him.