@HebrideanHecate Apparently stabbing attacks against children are a "thing" in China.
According to these two youtubers I follow, it's a very China-specific way of disaffected men (of whom China has plenty) to attack against society. I can see if I can dig up a video where they discuss this, but if I remember right, the impetus is not just that one-child-policy families put massive resources into their single children, but also the importance of children as carriers of family name and providers for their parents.
It's enough of a thing, that daycare workers and school teachers run drills on what to do in case of a knife attack, and facilities have all kinds of security measures in place to stop would-be attackers.