Twisted, Fanjo, just to save you the trouble of having to think about it or google it too much; one of them had a tag on and was on curfew because he tried to travel to Syria so I think that the standard excuse/platitude this time will be that he was harassed by the security services when all he wanted to do was take medicine/distribute food/care for puppies in Raqqa so of course it's all the fault of the French for being so suppressive and nasty.
I can't agree all young Muslim men should be interned, but just maybe it would have been nice if the ones it's known are associating with Daesh and trying to fight with them were. Might have been more effective at preventing this than putting them on a tag and telling the naughty boys not to stay out past bedtime.