Geektastic:
There is ample and widely reported evidence that terrorists used the influx of refugees as cover. As was blindingly obvious to anyone, to be honest. Whether THIS attack is their responsibility or that of their fellow travellers is somewhat academic.
I'll dispute that. Every single attack in France has been done by someone who is a French or Belgian citizen.
How exactly refugees who have no knowledge of these people can, or can be used to, "provide cover" is not "blindingly obvious"... in fact, I can't see the connection at all. Perhaps you could elucidate?
Blaming refugees for the actions of French citizens is even more ludicrous than blaming the rest of the French population.