Allison Hanes: Bissonnette's guilty plea not enough. We need to know why

Hateful ideas, mental instability and guns.
That lethal combination seems to be what motivated Alexandre Bissonnette to walk into a Quebec City mosque just over a year ago and open fire on worshippers as they finished their evening prayers. Or at least that’s what we are left to conclude.
Bissonnette took responsibility for his shocking crime Wednesday, pleading guilty to the murders of Azzedine Soufiane. Ibrahima Barry. Mamadou Tanou Barry. Khaled Belkacemi. Abdelkrim Hassane and Abo