technology probably isn't the answer here
There are, I understand, a lot of cases in the USA where a child gets hold of a gun and accidentally shoots someone. And also, I have read, a surprisingly large number of cases where policemen get shot with their own gun. (Hard to get good stats: the gun lobby in the USA seems to be against them.) Both of which, "smart guns" could prevent.
But - if I was a person who thought I should have a gun for self-defense, I would really want a non-smart gun. Why? Because of my experience with technology over the last ~ 30 years. Personal computers; electronics in cars; the way my phone or laptop sometimes don't react to my finger; etc - all have a nasty tendency to be unreliable these days. And if I thought it was worth having a gun around, I would want to be as sure as possible that it would work properly if I needed it.
Potentially, technology could work well - but I'd want a decade or two of evidence to convince me.
Looking at things from a different point of view: some years back, driving while drunk was regarded as sort-of-normal - and the accidents which happened because of that were "just accidents". It seems to me that in the USA shootings still tend to be regarded like that. Perhaps we should try for a society which requires a suitably higher standard from any/all gun owners. (Shooting while drunk, or not being able to properly see what's in the way, or just-because-the-person-in-front-of-you-*might*-be-a-danger all seem to be rather too accepted.)