The answer is really very simple. A large number of them are probably on this boat And many like them currently afloat on the seas around first world countries.
It’s only a small step from seeing members of your family drowned in the humanitarian crisis that Europe (and Asia) is increasingly ignoring, to this.
In Australia, the Abbott government is increasingly fanning the flames of religious and social intolerance with the rhetoric around “home-grown terrorism.” Not to mention devoting close to $1 billion to combating it.
And to be fair, there is some indication that some young men are being increasingly attracted by the ISIS rhetoric.
But we ignore the anger that is generated by our treatment of refugees at our peril. These boats are the real recruiting ground for ISIS.