That's because it's not a war of any kind. It's more like an Accommodation on Drugs.
There's rehab, community service, counseling, medication, diversion programs to avoid jail time. There's little actual punishment. More like a temporary interference.
When you see all these people locked up for so-called "drug offenses" they have committed other crimes and that's why they are in jail or prison. In their minds, it's only for a drug charge, they forget all about that family of five they killed when driving under the influence. They forget that they forgot and left the baby in the bathtub until it drowned.
Not to mention that the police do not want to take on the gangs. The gangs have then out numbered and outgunned. It wouldn't be a contest.