It's become a vicious cycle. As Mexico encourages it's harder working people to leave (the elite there don't work hard), Mexico actually becomes worse off. Mexico is quickly losing what could have become it's middle class but it doesn't want to allow that ---or it would.
This is completely false. The illegal immigration problem has grown exponentially as we have taken up policies of non-enforcement, handouts and amnesties. This problem is a crime wave created by a govt that will not do it's job.