"Nothing ticks off the comments section of the Denver Post quite like treating undocumented immigrants like actual human beings."
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Undocumented immigrants have broken The Law.....and there exists both Federal Agencies and Federal Courts that are empowered to deal with undocumented immigrants who have broken The Law. 
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The worst thing that will happen to an illegal immigrant is that they are returned to their home country. And any attempt to portray Mexico, for example, as being akin to Nazi Germany where Mexicans who are returned to Mexico face the same fate the Jews faced during the German Nazi Holocaust defies common sense.