you don't know what may have been prevented. Obama started to do this on a voluntary basis from"the 7 countries"refugees haven't committed terrorists attacks in the U.S. nor have anyone from the country's we are vetting but it's still an excellent idea right...
The problem with those countries is they have no ability/desire to work with Customs -and the travelers/refugees lack documentation, or the documentation is unreliable.
It's simply another layer of ability to see a true picture of whom is wanting into the USA.
There is mo reason not to do it -and many reasons to do it where documentation itself is unreliable/sketchy.
Did you know ISIS has a passport printing press in Syria?
