these groups are not similar at all.
The Zapatistas ( EZLN) from MExico is quiet pacific compared to the other groups. It has nothing to do with terrorism and religious extremists.They never fought (beside one rebellion in early 90s) or made any terrorist attacks. They represent ( at least thats what they say) the cultural resistance of the poor Maya indians vs the mondialisation, capitalism, Mexican power tryng to erase them etc....
So they have a pretty good image in the left wing population and that kind of groups....