The Worst School Disaster In US History...

Was not at Columbine. In fact it wasn't even in the last half century. In was in the 1920's in Bath, Michigan. You can get some details Here and Here.

It seems Mr. Kehoe was unhappy about the tax increase for the new school and got himself elected to the school board. When the school needed some electrical work he offered to do it to save some money. In addition to the needed wiring however he also wired the school with explosives. 45 people died, mostly students. There would have been more but not all of the explosives detonated.

So next time you hear someone complain about school violence and long for the good old days, hope they don't mean the 1920's.