Actually, us training and advising the Zetas is completely incorrect. I had the privilege to work in 2/7 when we were conducting the Mexican Training Initiative (MTI) and I currently work with the Mexican Army executing CN / CT related Theater Security Cooperation. While working with senior Mexican officers, I have come across a few who attended MTI and now are either O-6s or O-7s in SEDENA. They have a very different story to tell. While a few (very few) did leave the military and go to work for the cartels (leading to the creation of Los Zetas), most are either out of the Army leading productive lives or still in the Army serving honorably. To them, the fact that a small handful of those that received our training "crossed over" is horribly embarrassing and they work extra hard to keep the GAFE (Grupos Aereos de Furezas Especiales or Airmobile Special Forces Groups, the initial recipients of our training) above reproach. In other words, it is a radical oversimplification and frankly, gives the impression the we (SF) created and organized the Zetas and stigmatizes the good faith acts of the 7th and the honorable behavior of the majority of those that attended.
Sorry, bro, but, I have heard this misstatement allot and it bugs me.