Who are we sacrificing here? Virgins? Old people?
Of it's old people, maybe a few but if it's younger people that have their whole lives ahead of them, then only one. On second though, how intelligent are these 'innocent' people? I'd be more willing to sacrifice someone who isn't going to contribute that much to society than say the next Einstein. What do you consider innocent? Are they just people that weren't involved in the event? If that's the case, are people that are in prison for violent offenses considered innocent?
I guess I answered the question a little too soon.