Cold War hangovers and perversions
Just so everyone understands, t this program began as an effort to fight world wide Communism. It was advanced by Republicans in JFK's Cabinet. It's what brought Barack Obama's father to America. The idea was to bring people to America, educate them, inculcate American ideals in them, then send them back to their home countries to become America's advocates. Funny thing happened. In the students absence, their native countries became totalitarian. Then, someone decided it would be good for these people to stay in America for future use in their native country. To that end, these tech students while displacing Americans, don't pay taxes on something called OPT nor do their employers. At last measure, only 3 of 5 American STEM graduates are employed in the field of their education. America has excess brains. Perhaps after a half century, the results of these foreigners staying home and living with the governments they created, may yield results. No American Affirmative Actions or social welfare programs. Maybe all those sensitive government computer contracts could then go to start-ups ran by patriotic Americans instead of Chinese backed entities.