I am dusting off a vague recollection from a past incident, but, I believe with most insurance policies, acts with instances of illegality (breaking a law) or knowing illegality is often stated in the policy(s) as a non-covered event, meaning if you are knowingly breaking the law they will not cover you. At LZ there are many issues, but, their largest issue is going to be a person of authority (Dean of Students) knew of issues, did not address, let it continue which it did while actually escalating. Because of that they have opened themselves up to extraordinary liability. Their insurance might cover it, but, the policy provider might have a very good justification for fighting the claim. it was not a one off they knew nothing about.
To that same end, the reason the DCFS investigation is still open. I believe after the issues that came to light a decade ago, in Illinois statue was passed making it a felony for a teacher/administrator to not report known child abuse to DCFS or law enforcement, which may be why the Dean of Students is not responding to inquires at all.
That police investigation can be re-opened really quick once there is a valid record (depositions or trial testimony) or additional facts come to light. All they need is for one witness or co-conspirator to break and it will all come tumbling down.
BBCH your willingness to suspend all common sense and reason that "nothing is proven yet" after the resignations/terminations of several staff members is mind blowing. It is precisely that attitude that has allowed this type of behavior to proliferate at that school.