Of course it's mainly Mexicans.
But there are OTM illegals that are causing problems in other areas. Unless you only want to solve the mexican problem and let the others slide.
If a person is wounded and losing lots of blood you deal with the major wound first before worrying about a scratch that wouldn't even require a bandaid.
I've never heard of a hospital closing down because illegal chinese are abusing the emergency room.
Throw a rock into a pack of dogs; 95% are spotted, 3% are solid white, 3% of the white are also short-eared.
What's your chance of hitting a short-eared white one?
Solutions are usually based on what would curtail the majority of infractions.