This post by Scott Eric Kaufman pretty much says it all:
Some have argued that it’s different now — that radical Muslims are unimaginably more horrible beasts than Nazis — but if you believe that, you’re a Nazi who believes that even the most mass-murderous of mass-murdering fucks to ever walk the Earth are somehow morally superior to the current crop of Islamic extremists.
Because I’ve seen that argument made tonight — “We should have let Anne Frank in, because white German spies would’ve just behaved like spies, whereas these brown Muslims are terrorists through and through” — and I’ve witnessed it repeatedly, mouthed by people who don’t realize that they’re extolling the moral superiority of Nazis.
That bears repeating: They’re extolling the moral superiority of Nazis.
The logistical difficulties in hosting refugees are worth discussing in this instance, but the moral case is entirely one-sided. No point in farther discussion.