So, let me get his straight.
Success in the war on drugs in Peru and Bolivia led to more production and violence in Colombia. Success in Colombia led to more shipments through and violence in Mexico as well as shipments through Venezuela (I'm not sure anyone has a good idea how much of the increased vioence in Venezuela over the last several years is related to drugs, but let me know if there's something out there.) Now success is Mexico is leading to the escalation of drug-related violence in Central America, especially Guatemala.
I'm not sure how much more success I can take.