> If you were asked: “Would it be good if this 0day was used to apprehend a terrorist?” you would probably say “this is good”. If you were asked “would it be good if this 0day is used to arrest someone and then torture and waterboard him 183 times?”, you would probably say “this is bad”. So if your 0day was used to capture KSM, it is probably good? Or bad? Things get very complicated very quickly.

This is a version of the very classic problems "does the end justify the means" (should one torture a terrorist to prevent other terrorist acts). Much to the chagrin of utilitarians everywhere, the answer to that question is NO, because answering yes leads to a bottomless hole of infinite evil.