Hang on, are we upset that immigrants are taking the jobs of poor people in America?

I thought based on original post we were upset immigrants are taking high paying specialist jobs from the rich techies in San Francisco?

Or are they just just taking all the jobs while miraculously not spending any money and not creating any demand and not participating in economy at all?

I just want to understand this evil scourge appropriately.

P.s. (And oh, boy, will I compete in the "knowing about being poor" with anybody on HN :)