Alejandro Hope, a frequent and much valued commenter on this site, is quoted in this week’s Economist saying that Mexican law enforcement responds inappropriately to massacres perpetrated by organized crime groups (e.g., the Sinaloa Cartel and Zetas). Alejandro argues that when, for example, a group of decapitated bodies is dumped in a gang’s territory, the police react by stepping up enforcement in that territory. This creates an incentive for gangs to commit atrocities and deposit the corpses in the territory of a rival.
Alejandro’s Kleiman-esque suggestion is for the police to change the incentives surrounding violence in Mexico. Instead of increasing enforcement wherever bodies are dumped, law enforcement should instead focus on the geographical area dominated by whichever organisation committed the murders. Instead of being indirectly rewarded by more law enforcement attention to a rival, the gang that engaged in mass murder would be punished by increased police attention.
He makes his argument in more detail here (In Spanish).