He said students “appear to employ social ostracism as a means of ‘self-policing’ their community, often in response to allegations of serious misconduct”.
“This occurs in the absence of formal processes and without proper investigation or evidence,” Mr Graham said.
Mr Graham added: “I did not find on the balance of probabilities that this culture specifically caused or contributed to Alexander’s death, but it did give rise to a concern that circumstances creating a risk of future deaths could occur.”
Mr Rogers’ family have been raising money for suicide prevention charity PAPYRUS.
In a tribute on a fundraising page, they said: “The loss of Zander has been seismic.
“He was and is the epitome of what is good in this world; kind, warm, funny, and an incredible friend to so many.”
The Department for Education’s been contacted for comment.
