Mexican Government Repression in the Zócalo

The march was entirely peaceful. There was no sign of any violent tendencies. The outbreak of violence brought to mind the events of October 2 in Tlatelolco. Citizens were protesting peacefully while the government plotted and organized the repression. Did the government strategists think of combining October 2 with the Halconazo? It seems so. What better strategy than to create chaos, violence, and confusion?