It is impossible to know how many civilian lives have been saved from conventional weaponry (including your own) because the threat of nuclear holocaust has nullified any benefits from such attacks. For example, I find it extremely hard to believe that the US mainland would have been able to go this long without being bombed without its nuclear arsenal. We've pissed off a lot of people that would love to destroy us but they can't because we would carry out our own holocaust within minutes. Countless American, Russian, Chinese, Israeli, and Indian wars have fizzled out before the first shot because of the implication of nuclear bombardment.