The best way to control roaches is to eliminate their food source and make their environment hostile to their lives.
That's a little unfair, LU, an perhaps a bit below you.
Yes, these people are taking advantage of whatever they can, including soft "laws" in the US. Now that the laws are in the process of being enforced, they are going home, which is what we want.
They are not "roaches" and I do not completely hold their decisions against them. Except the criminals, but those are roaches whether imported or not.
They are mice in a maze who look for the next opening. Respecting the Rule of Law is as foreign to their minds as the thinking of UP is to ours.
We need to deport every single illegal, and not let side issues stop us. But only political will can stem the tide.