It is interesting to see the different views on immigration. Here in the UK, leading up to the brexit vote, everyone said blue collar workers were the problem, because they depressed wages for the poor and made the middle class richer because they could build cheaper houses, pick cheaper crops, etc.
In Singapore, the rage is mostly against higher earner immigrants, because they take all the good jobs, making the middle class in Singapore poorer.
I'm sensing a bit of a mix in your US centric argument.
All in all, a lot of people just hate immigration, always have, always will. It is a topic as old as time.