Is it OK for you to kill the man who kills your son? It is not. Is it OK for you to steal the car of the person who stole your car? Absolutely not.
Just like its not OK for us to simply kill the man who is responsible for several thousand deaths. Let justice prevail - let a jury convict him and at least society says he should die. It is not our business to say "just kill him".
It is also wrong for all of you to be jubilant about it.
People like you are why tyranny exists and why terrorism is so damn hard to fight.