They are propaganda slogans used in the place where a rational argument should be. Rational arguments being unavailable for mass anti-merit immigration into a welfare society, we are given endless repetitions of mindless slogans instead. It is clearly ~overextended~ 'family values' which don't stop at the Rio Grande, or anywhere else. Those 'family values' are necessarily undefined and meaningless, which acknowledge no boundary or possibility of definition. There are no 'jobs Americans won't do' that should be done, at the wages, or in the conditions, that only foreign criminals or braceros will accept. It is unrealistic to have millions of foreign criminals running loose, and expect this not to be very bad for the citizenry. It ignores the reality of what the government is; a compact between officials and citizens in general to defend against foreigners.