Not sure just how hard Calderon was trying in his war to eliminate all the cartels, but this story is a great lesson about what happens when one relentlessly pursues the leadership of a narco gang.
Calderon launched a war on half a dozen cartels at the beginning of his term. By the end of his term he had 60 to 80 cartels to contend with.
The same holds true for terror groups. Every time you read how we dispatched another al Qaeda leader, ask yourself what that really means.
It means there's a new leader today, typically a younger and more aggressive leader keen to make his mark.
It seems the "cut off the head of the snake" strategy inevitably leads to more snakes.