You would rather buy it from your friend who would extend you credit when you don't have the money. Customer loyalty.
You just don't know anything about criminals so you take your law abiding personality and project it onto criminals.
Again, where are all the bootleggers who extend their (loyal) friends credit for booze?
Prohibition lasted for 10 years and the cartels (the mob) built up a pretty impressive infrastructure network. How come those networks broke down, and why am I to believe that the marijuana market should behave differently?
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Okay, you might be right, get back in 50 years and tell us how it worked out. Why do we still have organized crime if prohibition ended it? The networks didn't break down. They were torn down by law enforcement that wasn't hampered by "civil rights" and Constitutional protections. The bodies were dumped in rivers and buried in deserts. Those were the police! After they were torn down, they rebuilt, bigger and better.
Then of course, much of the criminal infrastructure built during prohibition just shifted over to drugs, prostitution, gambling and protection. That's why we still have organized crime networks today. If anything, there are more of them and they have much more power than they did.
Then too, recognize that prohibition wasn't ended by repealing the law. Federal jurisdiction was ended but municipalities were still free to enforce all prohibition laws and many of them did. Some of them still do. Just like municipalities today (upheld by the California supreme court) are free to completely ban marijuana sales within that jurisdiction.
Here is the sad truth about prohibition. The reason why prohibition was instituted because of fears that alcohol would contribute to the breakdown of the family, destitute mothers and children of alcoholics, alcohol consumption at younger and younger ages, increased homelessness, increased disease and illness, increased accidental death. There was a whole list of dangers.
They all happened. Everything the prohibitionists warned about actually happened. So what do we do? Prohibition is ended. Since prohibition ended, we have had laws, upon laws, upon laws slowly reinstituting the affectations of prohibition and spending billions on helping the victims of alcoholics, those destitute mothers and children, deaths by drunk drivers. Yes you can drink, just not in public, can't drink and get behind the wheel of a car, you can get your kids taken away, lose your job, Go to jail, lose your driver's license, have your car impounded. It's not done yet.
Maybe we should stop the war on alcohol while we're at it.