You would think legal immigrants regardless of their birth countries would hate illegals. The former had to bust their rear ends to become citizens and gets stuck with part of the bill to pay for the costs of the latter.
Race trumps all.
Many of them do...suffice it to say my naturalized/US citizen wife's comments about this issue consist of little more than a string of four letter words. Oh, and not surprisingly, her home country really doesn't get too worked up about rounding up their illegals.