The Left intentionally ignores this in their lust for background checks and gun confiscation but the truth of the matter is that she should not have had the most lethal of the weapons in a place where her mentally ill son could get at them. Had she done so, the major tragedy could have been only a minor tragedy or no tragedy at all. She was irresponsible and paid for it with her life.
Also, no one is mentioning anything about his behavior before the shooting. The media narrative is that he was an innocent victim of the weapon. That’s why there is no focus on him. He is a bit player in the “story” being told.