They are also told to openly report data so that they can problem solve with the students, parents and stakeholders. Otherwise you will not know if what you are doing as a community is working since you wouldn't know the magnitude of the problems in the first place. School principals that work openly with the community have a much better track record in improving the psychological and safety climate of their schools. And children who feel safe learn more. But it requires trust.
Trust building requires time and lots of contact.
If I were a principal I would want a commitment that sharing would not result in blame. Blame has never been shown to improve results. Parents working with youth can do a great deal to move the agenda. Focus groups of youth, not designed for school bashing, can help identify what and where the problems are and what might be done to curb any bullying, intimidation, harassment that may be overlooked by the school staff. Furthermore, we should ask youth how connected they feel to the adults in their school-community.