The drugs war in Mexico exists because drugs are illegal. The country also has endemic corruption
Cigarettes and alcohol causes thousands of deaths each year but they are legal so there is not a war against people selling them.
Surely people that are buying drugs are responsible for the Mexican drug war because if there was not a Demand for drugs there wold be no Drug dealers. I personally do not do illegal drugs because I do not want to support criminal activity.
You can't hold one isolated dealer responsible for every drug death or the whole trade. Your morality is inconsistent anyway and you are simply grandstanding on this issue.
There are lots of issues involved in drug taking and drug production the drug dealer is a small player easily replaced.