My concern with the issue is the poverty of most people in Mexico, even though the wealthy are making tons of money. If you think America has income disparity, take a look at Mexico: her natural resources, blessings as a nation, have been sucked up by the elite.
When ordinary and poor Mexicans leave (for America and other places), it is a pressure relief valve on the Mexican political system. The elites can just keep taking and taking.
Our innocent acceptance of illegal Mexican immigration only serves in the long run, to promote Mexican poverty and an evil economic structure. Some kind of velvet revolution is needed in Mexico.