Freedom,
I will never disagree that good parenting could help. My issue was with the fact that it was bad parenting which lead to the incident.
One issue I have is the analogies we present. I don't know how it is different that a person kills his family and others in the room to a person who kills his mom and kills kids. Just because the former didn't involve shooting children, it becomes a completely different thing? If bad parenting is involved, the person could shoot a kid, many kids or adults-age shouldn't matter.

To me a murderer is a murderer, regardless of who (s)he kills or how many (s)he kills. Sure, this garnered media attention, but he is as guilty as any other guy who killed an innocent human being.

Very good point about the mentally unstable person not having this issue back home. I agree. They don't have an easy access to gun or assault rifle - and that's why stricter gun control is an easy conclusion here.

Trust me, just because I teach my kid how to shoot in a shooting institution, I don't become a bad parent.