They are the debris of the civilization of Central America, expelled by a Defecating process that is going on in all human societies, and so have sunk into barbarism.
"Narrative of a Voyage to the Northwest Coast of America in the years 1811, 1812, 1813, and 1814 or the First American Settlement on the Pacific"
Gabriel Franchere
And as for actually formulating an actuality about something by unequivocally Defecating along the side of the road, it would not have been all that different than the elimination that dropped daily out of the open holes of the floor based Asian stools in the toilets of Thailand's trains.
"An Apostate: Nawin of Thais"
Steven Sills