If I saw a Mexican drowning as he was swimming across the Rio Grande to enter the U.S. illegally or one stranded in the desert after crossing into the U.S. illegally, I would try to save them as perhaps the so called "Coyote [unusual name assignment since it is the slang name given to one who illegally smuggles people across borders of countries] Saint" would do.
After I did that, on the other hand, I'd try to notify "La Migra" (the border patrol) so they could take them into custody. I have no idea if the "Coyote Saint" would do that as well, although I kind of doubt it. In any event, the border patrol if they share the same patron saint (St. Michael the Archangel) as police officers could certainlly thank St. Michael for helping to apprehend those who are supposedly helped from being apprehended by the "Coyote Saint."