Student Visa Restrictions?

Recently Bob Beckel from the Fox TV program – THE FIVE – postulated a solution to a problem that most American’s are unaware even exist.  Every year thousands of students come here from across the globe to attend our world-class universities and study advanced subject such as computer technology, nuclear physics, advanced engineering and others that are the key to high technology societies.  Sounds great on the surface; universities profit and the students can go home to improve life there.  In most cases that is exactly what happens.  However, those from China and some Islāmic countries often have a far more nefarious purpose for attending.  Nearly all from China and a good number from Islāmic countries take that knowledge and turn it against us.  Bombs radicalization and general destruction of anything western seem to dominate the purpose of foreign Islāmic students.  From China the threat is more insidious than that.  Turning their skills toward stealing our military, social, and financial information for the sole purpose of leapfrogging us to a point where they can dominate world economic political and military events with the US impotent to stop them.

Paraphrasing Mr. Beckel’s postulate: Why the *&$$ are we allowing it.  He suggested a moratorium of visas until we can figure out a way to separate the wheat from the shafts Again, on the surface the idea has potential.  But, is it a necessary, or potential a good idea, or a bad idea. What say you all?