2 Peter is written with a slightly different message in mind. Persecution from without isn’t so much the them as false teaching from within. It must have been a crazy time in the history of the church: spreading the Gospel of this man who rose from the dead, who was apparently God? It’s no wonder that others tried to capitalize on that wild story and expand on it in their own ways. Peter leads into this discussion by encouraging faith and obedience, as well as a firm establishment of where the Word of God comes from.