From NPR's Lourdes Garcia-Navarro (link):

The exodus of Mexicans across U.S. borders is depleting whole villages of the young and the able, leaving small, broken communities behind. A recent study shows more than half the municipalities in 10 Mexican states are seeing falling populations. One of them is Guanajuato, which has one of the highest rates of migration in Mexico...

An NGO is trying to reverse the trend; perhaps those who support illegal immigration out of false compassion might consider helping groups like that rather than helping Mexico avoid its responsibilities to its own people.