"there is none" - That's when a pol has to create a boogeyman, someone the gullible can be made afraid of and it helps greatly if a media outlet supports everything a pol does/says, without question.
Pols also use the illegal immigrant as a boogeyman, and again it works on some as we see..."free education", "free medical", "welfare checks" etc. etc. Those who do the hiring and contribute to pol campaigns are not forced to accept any responsibility, the illegal immigrant is the boogeyman - end of story.
Most understand Mexico's economy benefits from those who come into the US to work and send money back home.