http://www.wnyc.org/shows/lopate/episodes/07252003 Scroll-down the above linked-page to listen to "Director Carles Bosch discusses his documentary about the massive Cuban exodus of 1994, Balseros."
About Twelve-minutes into the interview, you will hear the author say some immigrants even approved of Castro--but came to the U.S. to make money.
You will also hear how the U.S. recognizes that it is within the power of Cuba to keep its people from leaving to come here.
Why can it not be in the power of Mexico to control its citizens? Why in the case of Mexico, must it be America's job to keep them out?
Let Mexico, like Cuba, keep its people from coming here.