1700s The earliest known United States shooting to happen on school property was the Pontiac's Rebellion school massacre on July 26, 1764, where four Lenape American Indian entered the schoolhouse near present-day Greencastle, Pennsylvania, shot and killed schoolmaster Enoch Brown, and killed nine or ten children (reports vary).
Valid reason 1. In order to increase the cost of wide spread authoritarian action against the people of the Unites States.
Americans like to say that but when fascists and authoritarians turn up the most gun obsessed Americans always love them.
Nope, not a valid reason.