Actually, it was. So were the Birmingham church bombings. The Spanish inquisition. The 6-day war. The hundred-day-war. The holocaust. These events were set in motion the moment Adam ate of the fruit. Since then, we've been killing, robbing, lying to and cheating each other. We just can't help ourselves
The Father gave us a lifeline by sending His son, the Christ. But to this day most just ignore Him, or follow Him in name only. So, expect these sort of things to happen until time runs out.
Shooter is rumored to be a 70 year old taxi driver went into the school, ordered the males to leave, lined up the girls and shot them. Was angry with some of the Amish mothers. Claim is on CNN from a caller supposedly a resident in the community. FWIW.
On a warm Spring morning in May of 1927 the Treasurer of the Bath, Michigan Consolidated School District blew up half of the school building (intending to have destroyed all of it). Within the hour he had committed suicide (and more murders) in the middle of the village by detonating explosives in his vehicle. In all, 45 people would be dead & many more would be injured in the worst instance of school violence in U.S. history.
This sort of thing has been going on for a long time.