Neighbours hear automatic gunfire in the days before the shooting and no one bats an eye?
The normalization of guns and gun violence is a relatively new phenomenon in the USA and dates back only 30 years. Mass gun ownership, mass shootings and the deification of firearms, especially military style weapons, can be laid wholly on the shoulders of the radicalized NRA and the profiteers—Sturm and Ruger, Smith and Wesson, Glock, et. al.