It is always thus. Vulnerable people aren't able to secure much of the pie for themselves, and so the system's able to extract value from them and doesn't have to give them very much back. Immigrants as a whole give way more than they get. (citation)
Witness what happens in states where the GOP accidentally takes their talking points too seriously and succeeds in restricting immigration, and business starts howling about all the trouble the state is in now that they don't have a vulnerable workforce they can squeeze.