Now, I am not enamored with the idea of us ever having to use a nuclear weapon again. However, having lived through the Cold War, I do like the idea of having the deterrent available to us. When past presidents had to deal with the Soviet Union and the nuclear arms race, each side knew the other was capable of wiping the other off the map. Despite our philosophies being polar opposites, neither side wanted a holocaust.
I don't think we can say the same thing about the Iranian government. With the Iranian regime, we are dealing with an ideology that believes that they will receive their reward in heaven by fighting the infidels of the west and Israel. Their mindset is not like any other we have dealt with in the past.
The idea of reducing nuclear weapon stockpiles in and of itself is not necessarily a bad idea. Reagan and others negotiated with the Soviets to reduce arms. Our dealings with the Iranians, and the North Koreans for that matter, have shown time and time again that negotiations are futile. Obama himself said that the threat of a nuclear attack has gone up. Based on that alone, now is not the time to cut funding on missile defense or our nuclear deterrent.