ISIS actively recruits mentally unbalanced zealots to be used as the equivalent of suicide bombers. The mentally ill find such causes because it helps quiet the voices in the heads. Wackos seek out Islamist websites where they are carefully cultivated, groomed, and exploited. Plant a few messages and wait for the explosion to happen. It can also happen with no overt contact. This has little to do with religion and quite a lot to do with politics. Religion is the cover.
Two Canadians have been killed in three days, seemingly at random, by loner lunatics who recently converted to Islam. The killings had no obvious political message. Professionals would have made sure the message was unmistakable and the body count was high. Only idiot amateurs with a tenuous grasp on reality kill randomly in hopes of sending a political message. Michael Zehaf-Bibeau killed a solider at a Canadian war memorial . Martin Rouleau-Couture ran over over two Canadians soldiers with his car. Both actions are as stupid, senseless, and deranged as the loser tweaker couple who in June shot two cops eating pizza in Las Vegas hoping it would start a revolution.
Zehaf-Bibeau and Rouleau-Couture were recent Muslim converts who had their passports recently seized because Canadian authorities deemed them “high-risk.” Both actions were so random and unpredictable it is difficult to see how they could have been stopped.