While it's true that none of the "banned" countries has attacked us on our soil, most of them have attacked US citizens at one time or another, in the very recent past.
Iran..... remember the whole Iranian hostage thing...how long did they keep our citizens as hostages?
Iraq. Sadaam Hussein... nuff said...
Syria. They've been murdering Christians for many years now... getting worse.
Sudan. They've been murdering non-Muslims, and "wrong Muslims" for what, decades now? A true genocide.
Libya. Ever hear of Khadafi?
Yemen. Remember a bomb blowing the side out of one of our naval vessels, the USS Cole, killing 17 sailors and injuring 39 more...
Somalia. Ever see a movie called Blackhawk Down? Or, Captain Phillips?
Yeah, those countries mean us no harm, at all.....