I don't know.
I would like to say that I'd press it enough times to land me and my family a nice sum of money, but I don't think I could kill someone.
I would never kill someone face-to-face, unless they were seconds away from killing me, but I don't know about people on the other side of the world.
I didn't really care about 9/11 or about people dying the recent Samoan tsunami, so I don't think my empathy extends beyond my own social circle, but I don't know how much that circle of empathy would expand if I was responsible for the deaths.
Until I'm in that situation, I'll have to say no.