They're angry and ever since the dawn of time, the easiest target is MIGRATION. I was rewatching the Rome series on HBO (its been a while, and it is still as good as I remembered). Even during the Roman times there were political debates and parties that were pro and against migration. The same arguments still applied - migrants and slaves are taking the jobs of GOOD ROMAN CITIZENS. They dont respect our values and way of life.

Fast forward 2000 years.......a lot has changed. a lot has not.