Divergent goals in the drug wars

At first glance this seems contradictory.

President Felipe Calderon calls Tijuana a success in his four-year-old war on drug cartels, though he is unsure that making the border city safer has reduced the flow of drugs to the United States.

But this is one point that I do believe has a parallel to Colombia.  The U.S. and Mexico/Colombia do not have the same goals in the drug war, even though we profess to.  The U.S. wants to reduce the flow of drugs, whereas Mexico wants to reduce violence.  The problem for the U.S. is that it is entirely possible to reduce violence while not reducing the flow of drugs.