You're right, it's not a consolation, but education and children's access to firearms are the business of the parent. The issue in that case is not what to tell the grieving parent, but who to send to jail for negligence. Sorry, but bullshit parenting has a lot to do with school shootings.
And I'm not going to throw statistics at you, but I encourage you to check it out for yourself. Great Britain, Australia, and other areas where guns have been outright banned for private ownership have seen marked increases in violent crime. Just think about it. How would you feel about stealing from someone who lives in an area where NO GUNS are allowed? If you want an answer closer to home, just look at D.C., then compare it to, say, Houston. Or NYC, compared to Montpelier. Or L.A., compared to Las Vegas. I think you'll find that the results speak for themselves, my friend.
Edited to Add: The tragic reality of our world is that atrocities are committed, and people die. You don't ban guns because kids get shot by misguided youths any more than you lower the speed limit because people drive 60 instead of the posted 40. Of course, you would not dream of telling a grieving parent this, but think about the logic. Stiffer penalties for those who commit crimes with guns is the answer, and punishment to those parents who won't take the time to raise their children properly.
Edited further to add: Hey, Revel, check out this article I found:
http://news.bbc.co.uk/2/hi/uk_news/3710682.stm
Sad how they mention how easy it is to obtain firearms, even though they are outlawed, leaving law-abiding citizens at the mercy of armed criminals.