Is this just about Mexicans? The USA has different laws for almost every country. Do you people think the below info is fair? You can't blame them for trying. Waiting outside in line pleading to be hired for $30 a day is better than holding up the 7-11.
"The wet feet, dry feet policy. Cubans caught on the waters between the two nations (i.e., with "wet feet") would summarily be sent home or to a third country. One who makes it to shore ("dry feet") gets a chance to remain in the United States, and later would qualify for expedited "legal permanent resident" and status of U.S. citizenship."
WHOLE LINK:
http://en.wikipedia.org/wiki/Wet_feet,_dry_feet_policy
Many more die trying. Facts available.