I'd definitely like to hear more about what was happening there, but locking kids up (especially the video that was legitimately locked, not just held shut by someone on the other side) is a bad look for a school.
It has been very easy to feel constantly justified in pulling my kids out of school, even realizing that our local district hasn't had anything like the worst of the behavior we've seen.
Not sure I see any connection between violence in schools and this kind of behavior, though. Parental violence maybe ...