I think that is unfair. After all, Italians have created mafias wherever they have gone, and we don't talk about their lack of assimilation. Muslims can live in non Muslim societies and integrate - look at India as an example. 180 million Muslims, and less ISIS members than most western countries. 

The Indian police deals with returning ISIS members by handing them over to their families, and making the father responsible if these kids regress. The one person any Muslim kids fears more than the police is his own father.