This is a red herring; nowhere in the section of the report on him does it describe him as being mentally ill, and it was not a sentencing factor at his trial (https://www.bbc.co.uk/news/world-asia-53919624)

https://www.stuff.co.nz/national/christchurch-shooting/12258... : ". He said after being assessed by the psychologist and psychiatrist, there was no evidence the terrorist suffered from any mental disorders or psychiatric conditions, or that he showed any clinically significant cognitive impairment.

The psychologist determined he displayed a range of traits akin to a personality dysfunction, but not to such an extent as to constitute a personality disorder"

> systematic failure modes in socialization of today's youth

This is rather complicated, because we're talking about radicalisation; he was "socialized" (or at least brought to those views) by the wrong adults, which he chose himself.