This is one of the most common-sense ideas presented yet.
Frankly, the current situation in Europe - of the tide of migrants pushing against a reluctant established government - is giving me some hope. At long last, Leftist/Progressive entities are getting a full taste of what our Southwestern states have been experiencing, and they don't like it.
Perhaps the invasion of not-dangerous-at-all, mostly young males from Islamic states will finally awaken the deliberately ignorant EU to the dangers of allowing just anyone into your country. I would hate for the citizens of the EU to suffer, but, if that's the price to pay, it may be worth it.