It also allows them to alter the perception of refugees fleeing hostile governments from South America, as lazy bums who want to fuck up America by traveling over 4000 miles across mountains and rivers to get to America. Americans cannot be allowed to learn the reasons why these people fleeing South America, to learn that their governments were destabilized so that bananas could remain cheap, or so that oil prices wouldn't become cheap, or anything other myriad of pretzel shapes Cia spooks will create to justify their crimes against humanity.