Your point was that I'd get shot in the face if I grow weed where cartels operate. My point is that if weed were legal, there would be no cartel operating, because they have no means of profit.

If all drugs were legal, then the cartels would be fucked. They would have no revenue, and would no longer be able to pay their foot soldiers. Their empire would crumble. Violent crime has gone down in USA? The vast majority of violent crime that is left revolves around control of the narcotic black market. Legalise it, and watch crime fall even further. Well maybe not at first, as all those bad dudes currently profitting from the status quo would no longer have their easy revenue, and would possibly turn to more serious crime. But long term, I don't see how cartels can survive in a world where drugs are legal. They can't compete in an open and free market.