I personally would keep a close watch on any such "helpful" terrorists indeed.
Look at it this way; when Iran finally gets a functional nuclear weapon, even if it is by some miracle retaliated against by some responsible government *cough* *not obama's* *cough*, do you really think any sensible government would then accept any "refugees" from that area of the world, knowing that they might be some new manner of suicide bomber attempting to sneak into their country and set one or more off?
A tunnel revealer should obviously be judged by the value of his revelations, best measured by Hamas losses as a result plus avoided Israeli losses.
But the value of tricking an enemy into consuming his own and wearing out his welcome with his popular substrate is so satisfying!
They could walk across the Mexico-US border pretty easily, I think.The possibility of such terrorists would cause at least the present administration to open the border even further.