The big attraction for me to visit Roberto Barrios in Mexico’s Chiapas state wasn’t the waterfalls, it was to see the Zapatistas. The autonomous community near the Mayan ruins of Palenque is one of the strongholds of Mexico’s Zapatista National Liberation Army (EZLN), which burst onto the internal scene in 1994 on the same day the North American Free Trade Agreement (NAFTA) came into effect.   The movement, which continues to advocate for the indigenous in this poor region that borders Guatemala, has a knack for garnering international attention and was a favourite cause of Rage Against the Machine.   Although the turmoil and violence of the 1990s struggle has diminished, the state remains off the beaten track for most tourists who come to…