We have had illegal drugs since 1912 (when the First Federal Food and Drug Act was passed), yet it was NEVER this bad. Violence was not this bad during prohibition. This is NOT just drug lords fighting over who controls what drug route, but something more. Drugs are a factor, but appears to be a source of Income for a raising war against the ruling class of Mexico. Thus the drug wars is NOT being fought by people who just want to make money, but by people who sees the drugs as a way to pay for some other fight.
Mexico has gone through two severe problems in the last 10-20 years (And 30 years ago its economy almost collapsed), The first is NAFTA. The negative side affect of NAFTA on the small farmers of Mexico was to see their main product, Corn, having to compete with excessive amount of corn exports from the US. Prior to NAFTA such US Corn was kept out of Mexico. Since NAFTa Thousands (if not millions) of poor Mexican Peasants have been seen their income collapse. This had lead to the movement of Mexicans into the US (Mostly form Southern Mexico and Central America then North of Mexico City). This has been disruptive not only economically, but socially, men have gone to the US to look for employment while their wives and children remain in Rural Mexico (This is the norm among immigrants even in the 1800s, Families would follow their father/husbands AFTER he had steady employment, till then they stayed home). Thia has left a lot of male teens without father figures and as such such teens wander into violence. A more severe problem is such teens joining revolutionary groups. The US Media prefers to call them Naroc Groups, for the simple fact no one, including the Mexican Government wants to call them revolutionary groups (Especially since it is the 200th anniversary of the First Mexican revolution and the 100th anniversary of the second Mexican Revolution).
The other problem is the on-going problem of a fall in Oil Revenue do to a drop in oil production. The Central Mexican main source of revenue is oil profits and that is on a steady down hill slope. Oil Production peaked about 2006 and has fallen dramatically since that date. Prior to 2006, the general increase in oil prices hide the fact that Mexico was spending more and more money to get less and less oil, thus reducing revenue for the Central Government. With the decline in oil prices since 2008, revenue from the Mexican oil fields have gone down. This is made worse by the need for massive investment into Mexico's remaining fields just to slow down the overall decline in oil production (Which means even less money for the Central Mexican Government).
Thus Mexico is seeing a decline in revenues at the same time its peasants are in need of massive support. Something has to give, and what appears to be giving is the control of the Country. Mexico appears ready to dissolve into areas controlled by Warlords. So far the Central Mexican Government had prevented this using its revenue from oil, but as that declines further how long can it stay in control?
My point is the problem with Mexico is NOT the Drug Cartels. If the Government had a strong source of revenue it could attack the cartels AND help the Mexican Peasants, but the Mexican Central Government has no such long term source of revenue (Independent of oil). The dRug cartels seems to be groups who are looking for any source of revenue so to support their position within the Mexican Social system. I.e. NOT money for money sake, but money to be used for some other agenda. Some of these groups are tied in with the various large land owners in Mexico, others with the left wing opposition (and thus the fight, often more about other factors then who controls what drug route). Thus the drug Cartel are a symptom of a greater problem, and we have to address those greater problems (The fall and increase in the price of Corn AND decline in Oil Revenue) more then drug use.
More on Mexican Oil Production:
http://en.wikipedia.org/wiki/Oil_reserves_in_MexicoNafta and Mexican Social Stability:
http://www.thenation.com/article/36330/retreat-subsistencehttp://onthecommons.org/nafta-mexican-corn-and-commons