I was not aware that the drug trade was primarily marijuana from Mexico. If this is the case, then I have no trouble legalizing pot. And I say that as someone who doesn't use drugs off any kind... so it is not a statement of convenience.
From what I have seen and read, marijuana is pretty much in the same class as tobacco and alcohol. Even though mind altering drugs are something to be avoided for a long, happy and healthy life.
I lived most of my adult life in San Diego - and have traveled many times into Mexico. When I was young, it was a cheap place to get drunk and let off some steam. But you are right, that place has always been a a den of thieves. They have had corrupt governments, and greedy, dishonest politicians forever. A lot of it has to do with its history. It was a huge area to be a Spanish colony and nobody from Spain wanted to live there. As a result, a whole new culture evolved steeped in a tradition similar to the Western US during the 19th century. Pancho Villa is perhaps one of the most infamous Mexican terrorists who raided cities, trains and other targets in the Southwest. Interestingly, the Germans provided Pancho Villa with arms to fight Gen. Pershing prior to the outbreak of WWI. (My grandfather fought with Gen. Pershing using horse drawn cannon).
If this story of Mexico has a familiar ring to it, the only missing component is this Mexicans were not Muslims!
Mexico has a long history of violence, yet somehow the US manages to co-exist side-by-side with this lawless country. It is just another undeveloped, third-word country with which the United States must deal with at a time of rapid globalization. Mexico is a good illustration of just how far some countries must go before they can even hope to enter the mainstream of world civilization in the 21st century.