Yes. Like any artificially created black market, uncontrolled immigration is thriving. It will stay a black market, will all the bad things that brings, until we enable people to be legal.
Artificially created? You seem to want open borders with no government control of who comes here.
Cute, but that's a totally twisted liberal new-speak for people who broke the law and continue to break it.
Can we think of some nicey-nice ways to describe various other lawbreakers like thieves, murderers and rapists?
The phrase itself is a liberal talking point, for crying out loud.