The government is good at making some problems worse, but not very good at solving problems! That's our tax dollars hard at work: Doing something when doing nothing would have yielded better results! It's the same old story and can be applied to a lot of other social problems besides just drug abuse.
These murders are not drug-related, they are prohibition-related -- committed by cartels that were spawned by drug prohibition, that derive their power from the inflated profits of prohibited but highly demanded commodities, and that operate in an underground economy in which violence is routinely employed to resolve disputes or remove business opponents. It's similar to what occurred in the U.S. during alcohol prohibition, but on a far more horrific scale.
LINK: http://opinion.latimes.com/opinionla/2012/01/drug-war-time-for-an-exit-strategy-blowback.html