It looks like social services, teachers at the school he was in, the local police, psychiatric services, his mother and his absent father, all buried their head in the sand and failed this young teenage boy completely.
The image emerging is of a deeply troubled young man.
He had no contact with his biological father all his life and his mother moved around Canada like a nomad from the time he was 2 until he was 7 when his father took her to court to try to gain access to his son.
He started identifying as the opposite sex about 6 years ago aged just 11 or 12 and dropped out of school at 14...
Locals rarely saw him but did know his four siblings/half-siblings.
The police were called to his home on several occasions due to mental health issues involving him, including at least one instance where he was apprehended under the Mental Health Act for assessment.
Law enforcement seized guns/rifles from his home two years ago but his mother applied to get them back despite his ongoing mental health issues...
(Who on earth gives a gun/rifle to a mentally ill teenage boy other than an equally mentally ill mother who should have been barred from owning a gun too).
He was on Reddit MtF aged just 15 asking for advice from other mentally ill men who think you can change sex at will - this is a form of child abuse imho for which the platform should be pursued.
Later he began viewing online videos of people being tortured and beheaded...
His account with Roblox was closed after the mass shooting as other users signaled that he had created a game that simulated a shopping mall massacre...
Meanwhile, instead of having him sectioned for his own safety (and that of others), his mother went on a rant on Instagram two years ago telling everyone else to "be kind" to trans people like her son...
He was taking prescription medication and was also able to source various illegal drugs (presumably on-line) despite rarely leaving home and his mother apparently never suspected anything...
So many red flags and all studiously ignored for fear of being called transphobic.
Where else has that behaviour happened?
Oh yes, the grooming gangs - only that time it was for fear of being called racist.