We have no such weapons at all, no chemical weapons, no biological weapons.
Nuclear arms kill many people all at once, but other weapons kill many people, little by little, every day, everywhere in the world.
Reasonable regulations regarding the ownership of weapons are appropriate.
Chemical weapons are something that scares everybody.
We must take steps to prevent further nuclear weapons development or modernization.
It's very certain that North Korea is developing nuclear weapons for offensive purposes. They don't need nuclear weapons to defend their own country.