You've got to be kidding me. Seriously, people. This quote says it all -
"Migrants, regardless of their migratory status, should not be treated like criminals,".In the words of the internet, "O RLY?" Then how should we treat them? As pampered guests? I can guaran-damn-tee you one thing. If I got caught in Mexico, having snuck across the border, to do anything, I can guarantee you that you'd never, ever hear from me again.
The most telling bit of information from the article, however, is this tidbit, which might enlighten us as to the true reason this 'request' was made -
Mexicans working in the United States are a huge source of revenue for Mexico, sending home more than $16 billion in remittances in 2004, Mexico's second largest source of foreign currency after oil exports according to the country's central bank.
You mean that money might have something to do with it? And if we cut off the revenue stream back to Mexico, that the Mexican economy, along with the economies of several Central American countries, might absolutely collapse? Perhaps we should speed this process up a bit...