Another approach would be to restrict law enforcement activity to crimes committed against US citizens or legal immigrants or legal visitors to the US.
Perhaps there should not be legal investigation of crimes committed by legal residents or visitors of the US if the victim was illegal. Certainly when illegals commit crimes they can dash back across the border to evade prosecution, then reenter illegally with a different false identity.
People who obey the law should not be at a disadvantage compared to people who disobey the law.
Good point.