I said it was unnecessary. I've flown in and out of four of the countries on the list and didn't notice any security differences whatsoever with, say, Egypt or the Emirates. I've no idea where you read this nice little terrorist tale, but if it were so easy why haven't we been flooded with Libyan bombers? Because even if said terrorist could do this he couldn't get into the US. He'd be turned back and sent homje on the next flight out.
These just-so stories are the foundation people use to build this idea that we are under seige. We're not! I'm not saying we're beloved around the world - we blew that oppotunity with the Iraq War, the CIA torture regime, Abu Ghraib, etc. It was so hard to get into the US since 9/11 that almost no non-domesticv terrorist has succeeded. That's not an inference. It's the apparently inconvenient factual record.