I think we also experienced a few unusually high number of school shootings for a few years around 2016, and the media probably reports them less because Trump has taken up all of the media spotlight.
I seem to remember noting about a decade ago that we had a very high number of school shootings in the first 6 months of a year, and doing the math out it was something like 1.5 a month. I definitely remember talking to people about how crazy it was that we had one basically every few weeks.
You should hang onto it. They dug up some of the ones that were buried a few years back as part of a documentary and sold some of them at auction while the rest were donated to museums for preservation.