I lived in Florida in the 70s, and what you are saying is hog-wash.
Drugs, besdies being illegal have had a stigma attached to them.
There trade has not been free, and to suggest it was is ludicrous.
Even the term "Hippy" was an attack on drugs and their users.
There's two sides to this...
1. The pseudo-legalization of drugs in Miami in the 60's and 70's per the criteria I listed above.
2. Blaming the war on drugs for the existance of drug cartels and their violence
It is a fact that the cartels and dealers in Miami operated freely during that time.
It is also a fact that the cartels and their violence existed before Reagan made it US policy in 1986 to chase the cartels down in their own countries.
The title, "War on Drugs©" was coined by Reagan when he decided to send US military and law enforcement personnel into other countries to disrupt operations and chase down the 'bad guys' using preemptive tactics.
We can look at Miami in the 70's as an example of what happens when law enforcement looks the other way in regards to drug activity.
It's a myth to say that these cartels and this violence didn't exist prior to the War on Drugs.