Lott on campus carry and mass slayings

Everyone seems to think that school killings == school shootings. I discovered that searching for "school killing" or "school massacre" on Wikipedia both pointed to school shooting. No one seems to remember cases like the Bath school disaster, where 45 people were killed and 58 injured with hundreds of pounds of explosives. Or the Osaka school massacre where 8 were killed and 15 injured with a knife.