Umm, Mexico's border city stability has such more more to do with our illegal immigration policies than our war on drugs. Sure these thugs are funded by our addictions, but should we legalize drugs tomorrow, they'll just find a new revenue stream.
Yeah, maybe they would, but it would be about a million times smaller.
I find it interesting to model gang violence as a market. If drugs are made legal, the demand for thugs will go down. If the supply of thuggery is elastic, then former gang members will leave gangs and find other work. If it's inelastic, they'll find other revenue streams.