Interesting about China: a few years ago a madman went into a school and knifed a bunch of students. He was detained at the scene. Tried, convicted, appeals, and executed within 30 days. We need to do that here of course.
Yep, it happens a lot there. They have guards at every kindergarten in China. They have poles so they can trap the knife attackers. The poles have Ys on the end to pin them against the wall.