No one here questions the common sense of your words...the big question is, how one goes about it....without alienating Muslim communities in Europe, that can become fertile recruitment territory for Islamic terrorist organisations....the goal of the leaders of the new Caliphate.
I suppose I see things far more simplistically than some might.
A sword in one hand and an olive branch in the other... severe repercussions for terrorists and those who fund and support them, and a society open to diversity and receptive to those who wish to assimilate and live in peace.
We might want to ask is what alienates those who are young Muslims and makes them ripe for the picking by extremist groups.
I find that there is a bit of an irony that young males who in many cases are from homes of opportunity leave behind the privileges that they grew up with to join what they see is the true Islam.
If there were none to recruit this problem would pass on it's own, but, for everyone that blows himself up for his cause another seems to be ready to take his place.
Young men are always open to recruitment, in the USA back in the '60's young men threw off materialism and looked for the real meaning of life. Some became members of religious cults, others joined militant political groups. Now most young men in the US are self centered and are out of reach of cult leaders.
So, the element that seems to make these young Muslims open to recruitment is their faith, not that their faith teaches terrorism by it's self, it keeps them separated from society and leaves them open to terrorist groups.
Perhaps the cure is to lure them from their faith with self centered materialism along with teaching them that the book that they believe in conflicts with science and must be wrong. It seems to have worked here in the USA, many have forsaken the faith of their fathers and are out of reach of cult leaders.