Guns may be "created" to kill, but the vast majority are not (consumer US purchases). So what really matters is the practical use.
And guns are regulated, like explosives. So what's the problem?
I don't mind a safety course, and most sensible gun owners (which happen to be most of the gun owners) aren't going to object to that either.
And yeah the two year old did whatever. Oh well. Life sucks sometimes.