genes. mexico is a mix of bottom of the barrell Spaniards (from the Granada region, a poor, southern most region of Spain, genetically more Moorish/North Africa than white) conquistators, mixed with violent native americans.
native americans in meso-america were still on tribal warfare stage of civilization when Spanairds arrived. that's comparable to city states (with Aztecs being the most powerful one), where india, greek, china etc. all reached thousands of years before. in short, they were lagging behind in civilization development.
in civilized world, i assume after millenium of evolution, the violent, impulsive genes among population got reduced, due to arranged marriages (males with stable income got to marry, while violent thugs not as much), death penalties for murders. infant mortality among the poor were also high. i believe those all decreased shitty genes.
meso-america probably never had that selective pressure. instead, it actively selected for violence, with war-mongering tribes conquering and raping losers women. the thug genes got widespread. its similar to shitholes like Mongolia, where crime is also high, and Tuva, Russia's Mongolia (though they are technically "Turks", turks and mongols are the same nevertherless), has the highest rate of murder in Russia. no wonder Mongols were ruthless, murderous savages. their "kill all, burn all, loot all" and mass rapes culture is very similar to the native american savages.
then the Spaniards were too kind due to Catholism. the Catholic church is giga cucked, protecting the indians and such from "abuses" from the Spaniards. death penalty is also rarely used, and now universally abolished in latino countries. abortion is also bannned in latin america, so women have to have shitty kids that they didnt even want to have.