To solve the gang problem, I don't see any solution other than physical extermination. Given Chinese executing more than half of the death penalties in the world, Mexicans would need an even big quota. I can't imagine how it could happen.
Democracy is not the problem. Fake democracy is. I would rather be ruled by Chinese capitalist government than your mafia government. You can't demand to live in paradise. So it's most likely either or scenario.
Talking is cheap. Do you really believe there is a solution to the gang problem? Well I can guarantee you if the same thing happens in China, army will be sent over there. First batch of 100 gangs will be tried and executed with machine gun in weeks. If there is still problem there will be second batch, third batch until the mess is cleaned. We don't have a quota of the maximum death panelties per year. We will kill as many sons of bitches as necessary.