I understand what you are saying. The scriptures say this.....
Rejoice not when your enemy falls, and let not your heart be glad when he stumbles or is overthrown, Lest the Lord see it and it be evil in His eyes and displease Him, and He turn away His wrath from him [to expend it upon you, the worse offender].
I too am happy Bin Laden is no longer a threat to this world. However, we must remember that the only death that has the power to bring this world true peace, is that of Jesus Christ!