There have been at least 50 school shootings in the United States so far this year, as of September 19. Thirteen were on college campuses, and 37 were on K-12 school grounds. The incidents left 24 people dead and at least 66 other victims injured, according to CNN’s analysis of events reported by the Gun Violence Archive, Education Week and Everytown for Gun Safety.
https://www.cnn.com/us/school-shootings-fast-facts-dg/index.html
I agree it should be separated, but that doesn’t make it bad data. Unless you don’t know how to read tables, but that’s more of an individual problem than an issue with the information provided.
It’s bad data because it’s used as a contention point to make people think mass shootings happen ever 4 seconds or a school shooting every day. When this is completely incorrect. We get pissed at scientist who indulge in their papers, but this gets a pass?