+1
I assume you would have to do the killing by your own hand ie. with a gun and staring those innocents you are going to kill. If theres really young children in those 10 victims and all victims are unwilling to be sacrified, I really dont know would I be able to do it. I wouldnt do it, if whole world would know about this "execution" and that I was the killer. Even if it was some "inside"-thingy, that info has a risk to leak and someone would hunt me down for killing those innocents even if it would save thousands of people. But then again, if I think this way, I am not willing to sacrifice my life for thousands of people.
tl;dr: Would kill, if nobody wouldnt know that I was the killer.