But then that forces the Mexicans to get better jobs, which in turn works it's way up the chain and displaces everyone eventually.
Not really. As it turns out, as soon as they lay eyes on a 30 foot tall 6 eyed purple thing next to them picking strawberries with them, they decide that its about time they joined the ministry.
The problem there is that the majority of Mexicans are Catholic. The only thing that kept the people from rising up against the Catholic church after the pedophilia incidents was because the accused priests were white. Imagine what would happen if a minority priest was accused! Chaos in the streets! And then the Giant Monsters would be free to take over!
Actually, the preists got away with it due to the hand of the rich catholic diocese putting money into the government officials' pockets in exchange for "forgiveness" and the ability to move the preists into other parishes to rape again.
And as far as monsters taking over, giant monsters dont want control over the country, they just want better for their brood. Back on Monster Island is a slum opressed by the "Monster Mafia" and the Dictatorship. Would you want them to have to raise their grubs and hatchlings in a setting like that?
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I will rate you hard, and unendingly.