It was reported by eyewitnesses that the shooter in the Dawson College rampage in Montreal was wearing a black trench coat. Then someone found the shooter's page on vampirefreaks.com. There we have it. Everything has been neatly and roundly explained. He was a goth! That explains everything.
He was a loser, he was bullied, he was a goth, that's why he went on a shooting rampage. Surely, there must be more nuanced ways to understand aberrant behaviour. A goth is probably statistically as likely to go on a shooting rampage as anyone else in the general population. Son of Sam wore clothes from JC Penny: Does this mean that we should be suspicious of people who wear white shirts matched with sensible polyester pants?.... Well probably yes, but for other reasons.