@IRFRANK,
So many questions I have about how this tragedy became possible. These are not 100% thought out...but I think they are legitimate questions:
For starters, perhaps she shouldn't have allowed the 3 guns he had (inclusive of an assault rifle) plus 3 others in their house. With her knowing his emotional and disability issues, maybe she, apparently ...shouldn't she have prevented his access? OK, yes, she may not have been able to stop him (duplicate or stolen key to the locked case).
I think she like many parents with such a troubled child, may not have had the complete awareness thar she had a ticking time bomb? Maybe nothing could have been done utlimately.... but...doesn't her awareness of all the guns ... and his activities (and hers) raise lots of DARK questions?
Or she shouldn't have had them at all on premises, knowing his unstable emotional state? According to CNN, he was turned down from purchasing yet another gun the previous week at a sporting goods store.
This gun 'lust' (intentional exaggeration) seems by the current news reports to be either encouraged or condoned at some level. Granted I don't take this news as gospel truth. I am watching this part of it as it seems to indicate a behavior by his mother -- an awareness on her part or somehow encouraging his gun activity?
Why have an assault rifle at all? Alternately, how could he have tricked the system if she didn't know he bought it (forgery?) and or the multiple other arms and ammo?