I don't believe in it unless it is absolutely the last thing we can do. Sadly, there are people in this world that want us dead. I would want my country to protect me if people meant to cause death for me and my loved ones.
The bad thing of course is that nukes would kill other innocent people too, along with our targets, in whatever country we had to bomb.
We live in a scary world. People who you never even met want you and your whole family dead, and they are willing to die for that.
I think that one day it will happen. It's all a matter of time really. Our species has learned how to wipe ourselves out completely, and that is a knowledge that can never be unlearned.