How did stephen f. austin change from a defender of mexican authority to active participant in the revolution? ?

While he was staying in Mexico city, he saw how the central government was broke and how the municipalities of Texas had little hope if they didn't take the matters in their own hands. He recommended them to unite, organize a state and refuse the application by the supreme government, this led to his arrest and futher quarrel with the mexican government. At this point, while he was in prison, tensions grew between Texas and the central government, after the institution of a law which prohibited people not born in Mexico from retailing goods in the state, Texas went on the offence and Austin participated in the revolution.