He had no "history" of violence. He was a withdrawn kid with autism. If she thought for a moment that he would KILL her, I'm sure she would have done something immediately. Hindsight is 20/20, of course.
Also, HE was an adult. He was 20 years old. You cannot just commit an adult. You have to go through court proceedings or they have to be an IMMEDIATE threat. IOW, they have to have made serious homicidal/suicidal threats.
So you are for the only thing standing between us and a room full of dead pre-schoolers is the judgement of a woman like Nancy Lanza, a prepper nut who was stocking weapons and food like the Zombie Apocalypse was coming?
I think I want better assurances than that.
Make the gun companies pay a shitload of money, and we will get those assurances.