Originally Posted by PatrickHenry1775

All of the individuals you mentioned have a few things in common. They converted to Islam, but more importantly they traveled to countries in the Mid-East, or at least to countries where Muslims are the majority, and consorted there with terrorists that many with common sense recognize are Islamofascists. By checking passports, it should be possible to distinguish those potentially dangerous individuals from the overwhelmingly vast majority of American travelers who are not threats.