I'm not sure that we can learn anything from the "European experience" other than that they seem to be an example of what NOT to do. I'm trying to recall a single example in Canada where the Muslim community in Canada in general was aware of a radical group among their midst and did nothing to stop it. In both major cases of terrorist plots (the 2006 Toronto 18 case and the 2012 Via Rail plot), members of the Muslim community reported the activities to the RCMP when they became aware of them. The recent cases of "lone wolf" plots (the Couture-Rouleaucase and the Zehaf-Bibeau case), the terrorists, recent converts to Islam, weren't part of the larger established Muslim community and therefore didn't tell other Muslims of their plots. In the recent Aaron Driver case, the London  Muslim community learned of his radical views and tried to dissuade him from violent tendencies and warned the police about him. Canada doesn't seem to need to follow what other countries are doing.