And since it's pretty obvious where you're going with this, a nuclear warhead, just like a gun, doesn't go off on its own. Someone has to pull the trigger.
If you build a man a fire, he'll be warm for a day.
If you set a man on fire, he'll be warm for the rest of his life.
"Do nuclear bombs kill people?"
Two did. The rest of them saved countless lives by making wars between major powers impossible.
cancer does not kill people, duh.