The great comedian, George Carlin, had an interesting take on all of this. It always seems like the more religous you are, the more inclined you are towards killing. It says "Thou Shalt not kill", but the more religous you are, the more negotiable that becomes. It depends on whom it is you're killing. George Carlin said it best when he was alive, so this is basically his observation. One doesn't have to look far either to find examples of religion calling for bloodshed. The crusades, the inquisition, Northern Ireland, and Gaza all prove the point that killing in God's name is a sacred act and has always been defended by people such as this IDF Chief Rabbi, and the more religious you are, the more willing to kill you are.
Merkel says would welcome constructive Iranian role in any Syria talk (Reuters)
from the article: IDF Chief Rabbi: Troops who show mercy to enemy will be 'damned'