Not always the fault of the parents, read a story a while back about a Tunisian family that had a son that joined ISIS. They were middle class, and were well-educated, and despite all attempts he just got more radicalized.
We should stop treating it as just as 'religion' or 'terrorism' issue, and treat it as a mental health issue, as radicals like that shouldn't be out and about with a risk of harming themselves or others.
How governments tolerate radical Islamists out and about on ' religious freedom ' grounds is absurd. If a person walked through the street saying he would kill people (without a religious connotation), they would be given mental health treatment, not just jail.
Insane actions by insane people do not HAPPEN in a vacuum-----delusions and
hallucinations are MEDIATED by ones background. A muslim does not wake up one day and imagine he is Saint Augustine or the Easter bunny. Islamic
MANIA is obviously gonna be MUJAHAD