While I wholeheartedly disagree with expressing joy over the death of another, no matter what that person has done, I can see the point of those who take comfort in the fact that this man is no longer capable of committing the terrible acts he was known for. I can sympathize with that sentiment. I can't, in good conscience, take pleasure in his death. He is a child of God and a sinner like the rest of us (albeit his sinfulness caused quite a bit of damage, but still).
"Faced with the death of a man, a Christian never rejoices, but reflects on the serious responsibility of everyone before God and man, and hopes and pledges that every event is not an opportunity for a further growth of hatred, but of peace.” -The Vatican's Statement on Bin Laden's death
May God have mercy on his soul.