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Some of what the mexican Government's Illegal Border Crossing instructions for its people, the ones they wans to leave, says:

DANGERS OF CROSSING IN HIGH-RISK ZONES
Crossing the river can be very risky, especially if you cross alone and at night..
Thick clothing increases your weight when wet and makes it hard to swim or float.
If you cross in the desert, try to travel when the heat is not so intense.
Highways and towns are very far apart, so that it could take you several days to find roads and you will not be able to carry food or water for that long; you could even get lost.
Salted water helps you retain body fluids. Although you get more thirsty, if you drink salted water the risk of dehydration is lessened.
...
Avoid calling attention to yourself, at least while you are arranging your residence papers to live in the United States

The slap in the face is the last page which says:

This consular protection guide is not promoting the crossing [of the border] of Mexicans without legal documentation required by the government of the United States; its objective is to make known the risks implied and to inform about the rights of migrants regardless of their legal residence.

So after instructing on how to cross without getting caught and/or injured illegally they then state that the comic book is all about legally migrating. There's not much in the comic about legally migrating other than a sentence or two at the beginning which then quickly disolves into the ins and outs of getting across illegally.