Pretty simple. He, just like everyone that is here illegally, everyone that has friends/family who are here illegally, everyone that employs people that are here illegally, or everyone that profits from people illegally here, he has something to lose if greater effort is made to remove/deter illegals from being in our country.
In his case, he will lose the free healthcare/housing/education/welfare that his fellow countrymen get for free in our country. It hits him economically, because his shithole country will have to pay to take care of every illegal mexican that we expel from our country.
If we just shot them in the fucking head and dumped them in the sea, they would no longer be a problem for either country, but somehow I don't think he would like that solution.
Intoxicate the night
Hypnotize the desperate
Slow motion light
Wash away into the rain
Blood, milk and sky