As Toronto reels from another mass attack on the streets which took the life of a child and young woman, Canadians struggle to understand the unprovoked mass attacker.

Even before the latest attack, we discussed the psychology of the mass killer with the renowned criminologist, Dr Raymond Corrado, director of Simon Fraser University’s Institute on Violence, Terrorism and Security.

Dr. Corrado has studied terrorists and lone delusional attackers for over 45 years, from Baader Meinhof and the IRA to ISIS.

He joined Sandy Garossino in studio before this week’s attack on the Danforth.