Zetas Support Legalization of Drugs in Guatemala?

I haven't written recently due to a major work overload, but I had to share this. I'm hoping to get to a more detailed discussion of this situation soon, but for now, here's a quick summary. The new President of Guatemala, Otto Pérez Molina, has been very vocal recently about his campaign to legalize drugs in Guatemala (and to convince other countries in the region to join in this legalization) in an effort to fight narco-trafficking. This article appeared in the El Periódico newspaper today showing a banner hung on an overpass in Zone 13 in Guatemala City. The banner reads (in Spanish): Pérez y Baldetti cumplan legalizar las drogas y apoyaremos lucha contra maras. In English, it says, "If [President] Pérez and [Vice President] Baldetti legalize drugs, we will support their fight against the maras." Signed, Zetas 200. A similar sheet with similar writing also appeared in Zone 7. The newspaper calls the authors of the note "suspected Zetas," since no one knows if it was actually written and hung by members of the Zeta cartel and the people who quickly took down the sheet in Zone 13 were unidentified. According to the article, the president attributed the message to the opposition. Would legalizing drugs in Guatemala help or hurt the drug cartels? My gut response is that legalizing drugs would only hurt the traffickers if this legalization took place in their major market (the US) rather than in countries that are principally used as transportation routes. Yes, drugs are sold in Guatemala, and legalizing them might hurt the small-time drug dealers. Who benefits from legalizing the transportation, buying, and selling of drugs in a major transportation hub? Will the cartels pay taxes? I think I need to look into this further (I'm not even sure what President Pérez' proposal entails), and I'll post what I find for those of you who are interested.