kill Moussaoui?

the question on trial today is do we execute the "20th hijacker" for something he didn't do? his failure to act on the knowledge he had to prevent the 9/11 attacks may cost him his life because society demands this response to the horrors now being relived. so who will do the killing? what if society picked you to perform the execution? no problem? how about with your bare hands around his neck. you personally will be held accountable for squeezing the life out of this man as he stares into your eyes. can you do it? what if the price for not killing him was death? same situation, get it? if you fail to act as society dictates you must be punished with death as well. and the next person randomly chosen had to kill both you and him in the same manner? and so on down the line... each individual in our society must bear some responsibility for the capital punishment we inflict upon ourselves.