Prohibition of insatiable desires means that there's plenty of money to be made on the black market.
Which in turn spur the activities of organize crimes, due to the massive amount of profit - ready to be exploited.
This in turn will weaken the legal system, via corruption, bribery, threats, and outright murders.
If the cycle is left untreated, soon enough, we will witness the birth of a failed state - which is where Mexico is right now.
Sad but true, the origin of the problem in Mexico lies in the US, but the capitalist country also posses the potent antidote.
Legalize and regulate the drugs industry in the US, and the criminal gangs in Mexico will loose their main income in free fall rate.