Morality, ethics, and Terminator's Skynet

Simple question today, got this idea from another thread. Let's say Skynet is real, and in a few years, is going to unleash nuclear hell on earth. Quite literally, billions will die in one day. Somehow, someway, you come into the knowledge that Skynet is created by one dude. Would you take a sniper rifle, and put a bullet in this poor nerds head while he ignores his child and works at home in his office? And then blow up the place he works? Discuss.