We all know they type.

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A preliminary psychological autopsy of the man responsible for Canada’s worst mass murder reveals he was an “injustice collector” — someone who holds onto grudges until they boil over in rage.

When the gunman’s rage boiled over in northern Nova Scotia on April 18, launching a 13-hour shooting rampage, among his 22 murder victims were those targeted because of perceived injustices of the past, police said Thursday.

RCMP Supt. Darren Campbell described a “wrath of violence” during an update on the ongoing investigation. The RCMP revealed new details about events before, during and after the tragedy.