We can say that ISIS or ISIL are a sick bunch of perverts dredging, and each of them is responsible for their own lives, and there radical religion (belief system) must be rotten to the core, or at least barbaric. The government should not let any of those sick F's back into Canada. And what about the families they came from, and those that trained them?
So how do we ID a radical?
Well we can say they have no respect for our customs, it's rules, and laws. They disregard our laws, including traffic. They have a different philosophy, but then so do I. They live their sick philosophy. Does that help? Not likely.