Not surprising.
My ds was at a crap secondary. Placement already failing as academy didn't want to pay for amount of sipper he needed - and weren't supporting EHCP (prob because of first 6k cost).
He had a knife pulled on him in a classroom. A dinner knife. The school were at pains to reiterate it was a butter knife. Written evidence from them of incident after they called me and boy was excluded for 2 days. He has asd as school told me and so does ds alongside other disabilities.
Ds tried to end his own life as he said he'd rather do it to himself than have someone else do it.
Ds reported to police who said they won't investigate because school incident.
School tried to them deny incident and said it didn't happen as police didn't investigate - despite screenshot i still have to this day of the written evidence.
They are an academy so deal with own complaints so basically denied it and has lighted.
Refused to authorise ds absence whilst I took him to GP for MH crisis as he tried ti take his own life (was already waiting for cbt for school anxiety).
The extortionate effort gone to by the school to protect its own reputation and the lack of effort by the police to worry about this and possible future incidents - I can absolutely see how these failures repeatedly go about.