Chinese schools don't have any good reputation. Also, other teachers and also students must
be warned that a violent act took place at that school. They can then decide if they
want to teach or be enrolled at that place.

Also due to the fact that the murderer had previously threatened a female classmate with the same knife and the school did nothing.
It's possible, just possible, that had they acted the first time, then this poor kid may still be alive.