Most of these men are castoffs of the polygamous Islamist system. They don’t have families...
Polygamy causes war because of displaced males.
While I agree that there are "castoff" or feral men in any religious based society, most everyone has a family unless for unspecified reasons they are orphans.
I have seen no data saying they are "all" Alawites, for example..
Syria is fairly westernized country, or was....I think all these men are taking advantage of the civil war and have made the decision to try to establish themselves somewhere in Europe, at which time they will submit the paperwork to bring in their families, in the same way that our US illegals and legal migrants do. The war is only indirectly related. It's a catalyst but not the primary reason they are on the move.