Simon:
The ideology of Islam is much closer to Nazism than anything (Hitler was inspired by it and Muslim countries fought on their side and made up their own SS brigades). So it's ironic that the left is so adamant to support it (I mean the general left, not just the extremists).
It is impossible to have a reasoned discussion on this topic if you will not acknowledge I have the opinions I do in fact have. I know that you know this is a fallacy in other contexts so I do not know why this has to be an issue.
We've already repeated the mistake of shutting the door to those most at risk just like boatloads of Jews were turned away from the US to die in concentration camps.
Why not check who is allowed in and who isn't? It would be a bad idea to let the modern day nazis in after all wouldn't it?
..which is why a country-by-country ban is a bad idea, especially when not banning the countries that have actually send terrorist (curiously, Trump does not have business ties to those countries banned).
You did not say if we should fear muslims by the way. General Flynn believes that is rational...