The big climax of today's march in Mexico City seems to have been calls for Genaro García Luna to resign. Sicilia said, "I want to request the resignation of the secretary of public security, we want a message from the president saying that he did hear us". That's fair enough, though I doubt the request will go anywhere. Then Sicilia said, "We are also seeking this resignation to impede more deaths". This points to a basic problem underlying this latest bout of protesting: whether or not you think García Luna should go, his removal would not do much to alter the calculus leading gangs to kill each other today, which is to say, it would not make Mexico a safer country.
The Mexico City government says that some 65,000 people participated. That is certainly a significant gathering, but is a significantly lesser number than those we have seen for previous marches, which makes you wonder why. I can think of three possible factors: Mexicans are losing patience with marching, as the don't see it leading to any significant change; the group that set this march up did not do as a good job in organizing the protest; and the more politicized nature of this march turned off many who otherwise would have come.