[1] http://www.cnn.com/2010/WORLD/americas/02/02/us.mexico.marij...
I find your assuredness amazing. The truth of the matter is that nobody has the slightest idea how the legalization of cannabis is going to play out. The coming few years are going to be very interesting. Your prediction is that pot shops will end up on High Street. My prediction is that pot shops well end up in poor neighbourhoods.
It's also been pseudo legal in California for a decade. Dispensary owners haven't been slaughtered, and cannabis is the biggest illegal drug market.
Americans won't tolerate people being dipped in vats of acid. You cannot compare our system of law enforcement to Mexico's, they're vastly different. Our police will stop that. We've dealt with exactly that sort of organized crime before. Alcohol was once controlled by violent criminals, as were casinos. There are a number of reasons why violent organized crime is able to take hold in an impoverished region like Mexico but won't here.
>> I'm still against legalizing the worst drugs like meth and heroin...
These statements are incompatible. The "worst" drugs are all sold in massive quantity by drug dealers. Psychedelics afaik have never been a big money maker. If you want to essentially defund businesses that settle disputes with chainsaws, vats of acid, and the taped torture deaths of your friends and family, you'll need to legalize the use and sale of all the drugs.