That's one of the big points, isn't it? They aren't immigrants. Real immigrants come here ready to give up the old country, to "patriotically assimilate" as John Fonte puts it.
The notion that people who crash the border "just to work" will magically accept the Constitution and patriotically assimilate is a fantasy.
They come here these days to grab all they can get, legally or illegally, and wave their damn flags in the faces of the stupid gringos who let them do it.
Most have learned to HATE the USA.