The article goes into detail about the behind the scenes drug policy decisions of the last 14 years.
Tony Payan, a professor at UTEP, summed it up:
"It's like a balloon effect - we've never succeeded in cutting off the traffic, we've just pushed it around. We cut off supply in the Caribbean, and it came here. We cracked down on the Colombian traffickers, and it just meant the Mexicans traffickers got wealthier, and the violence came here."
Trying to cut off a market force is as futile as trying to cut off the gravitational force.