Bravo!
Legalizing them will dry up a MAJOR source of income for the baddies. Will there still be a black market? Sure, as pointed out there's still no tax cigs and moonshine. How big a market is it though? Right now the illegals are the only game in town for this stuff. Legalizing it - at the very lease legalizing pot - opens an alternative for what I'm sure is the majority of users. How many of these people are going to risk arrest if they've got a legal source of pot - one that has some basic quality control guarantees?
People will be doing this as long as it's profitable. Take the money away and the source of profit dries up. It will still exist but the underground economy will shrink considerably as demand drops.
How long do you think it will take, upon the legalization of marijuana, for Phillip Morris and every other suffering tobacco company to clear a sizable percentage of their fields and start growing pot? They'd seize the market from Mexico within a matter of months. With a (relatively) reputable domestic supplier, demand for the drug from south of the border would plummet. And as people have mentioned, without a business to fight over, the drug cartels would quickly fade away.
Even if pot were legalized it would be so heavily taxed that there would be a black market demand. Cigarettes are legal and there is a black market demand for packs without any tax stamp. Booze is legal and yet people still make and sell moonshine.
Possibly. There will always be an opportunity for a black market if goods can be gotten cheaper. But alcohol, tobacco and gasoline are all heavily taxed in this country, and no one is going to war to control the underground market because the demand just isn't there - most consumers will choose a legit product over a blackmarket product for a whole host of reasons.
Ultimately the violence in Mexico comes down to one root cause, and it's the same root cause for violence EVERYWHERE. Economics - more specifically, poverty.
Do you think these stupid f***s who are getting shot, stabbed and beheaded are doing it because they get job satisfaction out of their work? No, they're doing it because they're dirt poor, uneducated and have few opportunities to make a living. They can either pick avocados or sell t-shirts to tourists for a few pennies a day and starve to death, or they can join the drug trade and take a stab at making some real money. Take away the money, and 90% of them will go elsewhere.
The same thing is happening in the Middle East - do you think young Palestinians would be flocking to Hamas and blowing themselves to Allah if they had a decent job and a 401(k)? f*** no! But they're in a besieged country with 50% unemployment, they're poor, pissed off, and the only ones who will let them earn a dollar are the terrorists.
Desperate people will do anything to make a dollar.