This attack seems to support the CSIS analysis that Right Wing / Religious Right / Anti abortion groups are more of a threat for home grown domestic terrorism than "Radical Islam". That is born out by the Delta Police Constable Steve Parker scandal, the assaults by Zealots such as Gordon Watson, and by the sniper attacks conducted by James Charles Kopp in Canada. The Armed Forces Guy who took an assault weapon into the Quebec Legislature was a Nationalist, not an Islamist. Is Richard Henry Bain an Islamist? 
https://en.wikipedia.org/wiki/2012_Montreal_shooting
https://en.wikipedia.org/wiki/Denis_Lortie

So many of these folks seem to have a screw loose, long before they grab a gun, explosives or arson materials.