What people never seem to mention is the fact that these communities are incredibly close knit.
Muslim communities are typically much closer than people from other backgrounds are used to. Many times a huge extended family live in the same house, and there are often more family members living a stone's through away. The generations interact more, whether it be through shopping in the same shops, attending the same Mosques and schools, and just being more involved in each other's lives.
It always strikes me that there's often only a couple of degrees of separation when it comes the nutters who want to kill everyone having some connection to someone in Al Qaeda or a similar twat with terrorist connections.
Which is why I find it very difficult to believe that no one ever has any idea of how radicalised these people are, and of their desire to inflict pain on the western world.
Are we seriously expected to believe that those three girls who left for Syria a couple of years ago did so only because of some people they were talking to on the internet? No, more likely they spent their whole lives growing up and hearing anti-Western sentiment from the people closest to them.
This poison runs deep in these networks, and many, many more need to come forward to tell the authorities about any concerns.
But I think we'll have this problem for years and years.