I guess you missed the parts where some excellent fighters from the village killed several of the raiders very promptly and efficiently, and our man Jaguar Paw put a big hurt on the sadist -- whereby hangs a plot thread.
No, I didn't miss any part. I haven't seen, nor do I intend to see, the movie, "Apocalypto". I was just writing the plot through a liberal's eyes with modern day liberal flights of fancy.