Well --- some --- I won't mention any aliases --- have already pointed out the only use they have for Mexico is that it's a very cheap vacation spot -- but no means their favorite. They don't care if it goes to hell in a handbasket (I think that was the way my grand father said it) as long as they can look forward to unlimited cheap labor --- that's all that matters.
I'd rather pay a little more on a Mexican vacation and have a stable more middle class neighbor ---- which massive immigration isn't going to bring about.