I'll just copy/paste something Dr Manea said in the interview. You can find it on Deutsche Welle online:-

"There are systematic structures that make sure that the youth are separated from their outside environment ideologically. In Quran schools...and in their mosques, they tell children not to emulate the unbelievers, not to behave like them, not to love them, not to associate with them. How are you supposed to live within that society? So we can pour as much money as we want into combating violent extremism, but at the same time we seem to ignore that the nonviolent forms of Islamization are even more important. Because those who are willing to blow themselves up are at the last stage of a radicalization process. And we don't seem to want to look at what is happening before, because it would push us to raise serious questions about the type of integration, structures or policies that we have - or the lack of them."