Seriously being it's not a new problem. You said it wasn't happening back then and it was. Some were adults. Some now are adults. Why does revenge for getting punished at school somehow justify it? It was still a kid who felt wronged acting out in such a manner. Similar to kids today feeling wronged by their school, bullies, teachers, popular kids, whatever and shooting at them. This isn't some new phenomenon because we have 2 working parents and haven't gone to war. That's ridiculous.
Okay I took out all the accidents and adults. Focused entirely on students shooting teachers or other students. There were 8.
February 14, 1920: Durant, Oklahoma, At the Durant Normal School, teacher Albert McFarland, was shot and seriously wounded by one of his pupils.[97]
March 4, 1920: Cincinnati, Ohio, Student, Lawrence Angel, 14yrs old, shot his teacher Beatrice Conner through the arm for sending him to the principal's office.[99]
March 12, 1920: Newberry, South Carolina, William Scott, a student at the Helena colored school shot Henry Gray, another student.[100]
May 1, 1920: Summerville, Georgia, At the High School, student Alexander Potter, 15yrs old, fired six shots at his teacher, Prof. Ransom, but missed. Jackson was upset for a severe thrashing, and expulsion, went home to get his father's revolver, then returned to school for revenge. Potter was sentenced to 6 years at a reform school.[101]
November 4, 1920: Middlesboro, Kentucky, Prof. Barnes of Middlesboro high school was fatally shot by Adolphus Oaks, for whipping his sister the week before. Barnes had already submitted his resignation to the school board, after his students refused to go to class in protest over the whipping, and intended to leave the city that weekend. Oaks went to jail.[107]
March 3, 1922: Lubbock, Texas, After arguing with 15yr old Gladys Solomon, as they walked home from a B.Y.P.U. meeting Sunday night, Houston Upton, age 18, returned to her home and shot and killed her and her friend Nell Umberson, age 13, as they slept in bed. Houston then went to the Sunset school house and fatally shot himself in the chest. Houston was trying to brake up with Gladys that night, after dating for a year, and he wanted his ring back, but she would not give it to him.[112]
August 1, 1922: Cherokee County, Oklahoma, While a 5 kids where hanging out at the cuthouse of the Mount Zion school, two shots were fired by Bryant Hignight. One went wild, and the other entered young
Raymond Guin's head, killing him instantly. Three of the boys were questioned, but they all said it was an accident.[114]
February 15, 1927: Hempstead, New York, James O'Donnell, 18-year-old senior at Hempstead High School, shot himself to death on the stage in the school's auditorium. A suicide note stated that O'Donnell killed himself to lessen the financial burden on his family.[115]
Not one of these fits the current school shooting problem. They were almost all cases of one person being angry at another person and killing them. They weren't students going into the school and randomly shooting as many people as possible to take revenge. I still think this is a new problem, which needs to be examined further.