I object to nuclear weapons on a moral level. They do not act as a deterrent to most modern threats (fundamentalism, state sponsored terrorism, rogue states), and if, for whatever reason (most likely a computer glitch or radar false-positive) Russia decided to launch nuclear weapons at us, I for one would feel no better about it just because we had the ability to retaliate in kind, and murder tens of thousands of innocent people.
I wouldn't want to use them under any circumstance. Who would? Only a monster or a fool imo.