That's a shame but I don't see how that's the US responsibility. This seems like a call for imperialism more than anything else. Let Mexico govern themselves please.
And a human responsibility to not exploit people running away from a violent dangerous environment.
If you only care about people with a certain piece of paper then it says something about your total lack of ethics and human compassion.
I agree don't steal and let's prosecute those who do. What about those in Mexico that steal from the the people who are fleeing violence?
Why stop there, how about we do something about the violent dangerous environment? Would you support military action in Mexico and South America to try and fix the problems?
But I also know that it will be something that get tried, probably more than once if the US thinks that it has a moral mandate to fix the problem in Mexico and South America as the parent was suggesting.