You may be right about this guy. He has a $5 milllion price on his head and many Mexicans would turn him in. However, I really don't think as a whole Mexico cares who comes here illegally. If Mexico cared, we wouldn't be catching Chinese or MEs in US border towns.
Last week Santiago Creel claimed that 30 South Africans were arrested in Mexico with illegal passports and that only one was a terrorist. Remember, this was after Farida was caught at the McAllen airport.
Just like we know who are foreigners in our country, Mexico also knows those who are foreigners in their country.
No -- most don't care. They also don't really pay that close attention to who is getting on the bus or plane or train headed north and many might not be that knowledgeble about Central Americans to pick them out from Arabs posing as Central Americans. The human smugglers would take the money from anyone --- they certainly don't care about anything but money.