It seems the purpose of the attacks is to turn the mixed christian population of Belgium against the Muslim population of Belgium in order to turn the wider western population of Europe against the wider Muslim population of wherever leading to a Muslim domination via a new Caliphate.

It's roots lie in a thousand years plus of religious and political conflict between Europe and the rest of the world certainly not helped by the Crusades and European response to the collapse of the Ottoman Empire.

Why are ISIS using young European men to do what they want? Because they can. Why can they? Back to the start of my post .................