Mexico's Drug War: Who are the "Mata Zetas"? In the US we are taught that this kind of thing is repulsive and wrong, but with Mexican police being impotent against the violence in Mexico I will have to say that as long as this new group keeps their activities limited to Zetas and other assasins I say let them go and do their work that the police aren't doing...let them out the corrupt police and turn those corrupt police over to authorities that will prosecute them. Who is behind the Mata Zetas? Are the cartels that are opposition to Zetas behind it? Businesses tired of the extortion and murders like the casinos behind it? or is the Mexican government and private citizens behind the arming of this group of vigilantes?