I don't disagree with anything you've said here, it's pretty spot on in my estimation, I just don't think it's a sky is falling kind of situation. I was trying to answer the question: 'What would it take for his supporters to turn away from him?' and keep it in the context of why this thing just isn't an abandon ship situation, though it is certainly a fumble in a number of ways.

|Proponents say they are temporary measures, so that there is time to 'figure out what is going on'

Wasn't there a report from DHS in 2015 or so saying that it was the case ISIS was looking to take advantage of refugee programs to get agents into various Western nations? And further, that dept. heads felt some concern about the efficacy of our vetting processes?

Whether such a vetting process could ever exist is unlikely, but it would seem this is kind of a 'get your bearings' order. Your criticisms still stand, of course, I'm just pointing out it's not a totally baseless idea.