To me, that’s like the people who complain that gang-related shootings count as gun crimes. Not everything has to be Columbine/Las Vegas/Sandy Hook/Virginia Tech… (too many to list, honestly too many to keep track of, and I read the news daily. They’re all symptoms of the gun problem in the US. A lot of fun crimes are done by criminals? What a shock! But they have drug dealers and gang members in other countries, and we don’t see the levels of gun violence we do in the US. America is literally off the charts when they do international studies.
A shooting at a school is a shooting at a school, period. I can’t think of anyone who would defend calling it anything else. It doesn’t matter if it’s two kids fighting over who gets to sell drugs or just someone who doesn’t like Mondays.