Rapaire, I was reading Guest: 22 Mar 8:07AM (a name would help...)

He said:
The kid's mother is in a nursing home (car accident)and his father committed suicide last year. He was being raised by the grandparents. With an ex-BIA cop as the new authority in his life who was apparently a real jerk (according to a friend of mine from Red Lake who is a former district attorney in the area who had a couple of cases dealing with guy), on top of being mercilessly bullied at school, this kid never stood much of a chance either. So he took out his pain and rage at the world with grandpa's guns.

I wouldn't know about tackling someone with a gun. I'd have thought many people would be too scared and it would need someone with experience. But I don't live in a country where guns are common.