Never have We put this much effort into enforcing a misdemeanor. (Yes, entering the country without legal authorization is a misdemeanor.) Are We going to put this much effort into prosecuting Pedestrians crossing on a red light? How about fighting public drunkenness? Driving juuust barely over the speed limit? All of these actions are misdemeanors the same as entering the country without legal authorization.
What justification is there for obsessing over this misdemeanor and not others? It's not increased crime rates because study after study shows Immigrants commit fewer crimes than native born Citizens. It's not preventing such Individuals from receiving federal assistance without paying taxes because federal law already prohibits that. It's certainly not to reduce the presence of unauthorized Migrants in an efficient manner because most People currently in the country without authorization are here without authorization only because Their visas expired, making visa enforcement a far more efficient method. It's certainly not to prevent acts of terrorism because no record exists of a Terrorist sneaking into the United States in order to commit a crime. It's certainly not to keep such Individuals from taking jobs from Americans because the unemployment rate is already near historic lows.
It's not to prevent so-called "anchor Babies" because immigration Judges will not keep immigrant Parents in the United States just because Their Children are U.S. citizens. Between 1998 and 2007, the federal government deported about 108,000 foreign-born Parents Whose Children had been born here. These Children must wait until They are 21 before They can petition to allow their Parents to join Them in the United States. That process is long and difficult. [Cf., 212(a)(9)(A)(i) and 212(a)(9)(A)(ii) of the Immigration And Nationality Act]
So, there's no national security justification, no economic justification, no public safety justification. The only reason I can think to put this much effort into enforcing a MISDEMEANOR is a hatred of non-Whites and/or Foreigners in general. But that is not consistent with the idea of a country welcoming Immigrants of all stripes with the phrase "give me your tired, your poor, your huddled masses yearning to breathe free".