I stand to be corrected but I don't believe that any Hungarian & Czech refugees that came to Canada, after the Soviets quashed their revolution, have been convicted of a terrorist act in Canada. Likewise the Boat People from Viet Nam.

What drives one group to commit acts of terrorism and not others? 

A number of weeks ago the Globe ran an article suggesting that extremism didn't stop at the border. -White supremacists. I agreed with the article. What makes Canada feel that Muslim extremist ideas are any different?  Why the double standard?