I think it's fair to say the funding and huge catalyst for the war on drugs started in Miami in the 80's. During this time where was a ridiculous amount of violence. Violence that occurred in broad daylight, that had no regard for the public, with weapons police didn't have access too. CENTAC was started and gave law enforcement a more level playing field, and had a huge impact on the violence related to the drug trade in south Florida. It effectively removed lots of violent criminals from the streets. Just look at the crime stats before and after the initiative, it's pretty clear there was a public benefit.
While I agree there are very unfortunate unintended consequences of the war on drugs, I think we also have to give credit where is credit is due. Lets learn from it and do something better moving forward.