not deny someone entry to our country on the basis of speculation, and my own
I'm not sure if it is ignorance my friend. I think it's more fear of another possible 911. I think it's fear of seeing someone with a machete on the metro link. Fear is a strong influence especially for those who have never known violence.
It's no different than it was in the 1940's when we locked up Japanese Americans because of Pearl.
(My earlier response was not directed at you but I understand where you were coming from.