They are members of a 1400 year old murder cult commanded to enslave all of mankind.
Ship em back to satan's sand box, and bake till glowing for 10K years!
I’ll second that emotion.
Another way of vetting would be, for every male Syrian refugee, there should be one woman and three children. No single or newly married males under 21. Another choice would be “women and children only”. Then there’s, ‘Stay in your own country and help rebuild it’. America has enough problems, we don’t need new ones.