People who spend their lives building models in other sciences, say psychology, have missed gaps in their model... their whole approach, actually. Why is it inconceivable that climatology had equally glaring gaps?
At the moment, correct, in most places there is no need to defend against violent crime in most parts of the U.S. It's shortsighted to think it will always be that way. Guns for self-defense is a long-term form of insurance.