“And he purchased the guns legally.”
No hoops to jump through buying weapons as a diagnosed mental case?
A similar case is the recent Parkland shooting. That perp had a long juvenile rap sheet.
Many states do not submit mental commitments to the NICS database.
It's not an easy situation. The Founding Fathers were talking about sane people in the 2nd Amendment and it should be a difficult process to have someone's 2nd Amendment rights stripped, and it should be a difficult process to have them restored. I don't want someone sent to a mental hospital and stripped of their rights just because the liberal next door says he's insane.