Most school shooters in the 20th century didn't kill themselves.

if we do an analysis, since 1998, most school shooters have not killed themselves in the process. there is also a huge amount of attacks made by minors, contrary to what would start to occur from the 2000s onwards. the Andrew Golden case is proof of this. Andrew and his friend Mitchell wanted to play outlaws and attacked a school.
It is also interesting to observe that these attacks are many times more shocking than the attacks of the 21st century. Another thing is that rarely does one of them have any kind of contestation, which does not exist in our century.