Why is it ok to selectively choose what laws to enforce?

[StrongBad]

95. It is indeed a civil crime to be enforced by deportation

Classes of Deportable Aliens

Any alien that is in the United States may be subject to deportation or removal if he or she:

Is an inadmissible alien according to immigration laws in effect at the time of entry to the U.S. or adjustment of nonimmigrant status;

Is present in the U.S. in violation of the Immigration and Nationality Act or any other U.S. law;

Violated nonimmigrant status or a condition of entry into the U.S.;

Terminated a conditional permanent residence;

Encouraged or aided any other alien to enter the U.S. illegally;

Engaged in marriage fraud to gain admission to the U.S.;

Was convicted of certain criminal offenses;

Failed to register or falsified documents relating to entry in to the U.S.;

Engaged in any activity that endangers public safety or creates a risk of national security; or

Engaged in unlawful voting.

- See more at: http://immigration.findlaw.com/deportation-removal/deportation.html#sthash.RuFZ07G4.dpuf