What criminals are being allowed to persist and flourish? You're repeating propaganda from people who don't like immigrants of the wrong skin color.
Illegal aliens.
I don't care what you think is viable anymore, because the current US immigration enforcement authorities are themselves criminals and murderers. Until Kristi Noem and Greg Bovino are in prison jumpsuits, I will never support the enforcement of US immigration laws and wholeheartedly endorse all lawful efforts to obstruct it.