AI has nothing to do with this. It’s trivial to build a keyword based system to detect someone threatening/joking that they will kill all the Mexicans at their school.

AI hype is at play here as well, not only in the breathless press releases from AI companies.

I don’t believe a school has a right to monitor students outside of school but getting wind of a mass murder threat and turning it over to the authorities is the right thing to do.