This is the dirty little secret. The INS/Border Patrol is to slovenly and disorganized to deport all these people because it has to be done via airplane. Lots of flights would have to lined up along with proper security and other logistical hassles. Illegal alien Mexicans are simply bussed back to Mexico, which is easy as pie.
This could all be taken care of by establishing a tent city detention center out in the desert with a landing strip for airplanes. Make it the way sheriff Joe Arpaio makes his (photos)
Tent city detention.... where these illegal aliens should really be. Not released to the public.
Arpaio has dramatically cut prison costs since becoming sheriff seven years ago