I find it strange that you have to define terms when you talk, it is obvious from the context what we mean. Anyway, this is just anecdotal experiences... Say 5% of the people coming from these countries are terrorists, is it worth it to ban the other 95% due to risk? I say yes, and further I think we should ban countries that sponsor terrorism even if they don't ship them over here. If they don't play nice they get a timeout, and if they don't like it they can kick rocks. Personally, where we can prove they have supported a single act of terrorism toward a US citizen we should bomb them out of existence, but Trump is far nicer than me. I don't think all people associated with a culture/religion are bad, even if I think that religion or culture is bad.
It doesn't mean we shouldn't take sensible precautions...
Does it create a temporary snag with travel? Yeah, but I am sure the authorities are already solving this. They know people from Iraq, etc, are coming home. These are just silly arguments, but are largely non-issues... You can generally fly to banned countries via others, so it just means you have to take a transfer flight -- you still get where you are going. It's been rather easy to get to Cuba, for example, for a long time.. You just need to go US->Canada->Cuba or US->Mexico->Cuba. I doubt it'll be any different.. That won't probably help you if you have a passport from one of these countries, however, since you will be denied a visa on arrival.
Anyway, my other posts are irrelevant to the thread and have nothing to do with this subject.