Gregory I increased the political power of the pope because he reformed and rewrote some of the aspects which were expected of the papacy, but which were things he did not want to do anymore. Upset by the privacy he used to have as a monk but which he no longer had anymore, he set out to involve himself more in the larger population's life by sending missionaries to England and by writing dialogues commenting on many different things. He also reformed and revised Roman worship of his day, which included more political power for the pope.
Maintaining order in a society is not an example of providing for the common defense or establishing justice. It is an example of insuring domestic tranquility.
