"Why be Catholic?" because (C)catholic means universal, and we are all evolving even as all nature does continuously, including consciousness of the essential relatedness of all life, so, we Catholics must remain open to what is authentically catholic, universal and transformational.
Traditional Catholicism (Catholics) is (are) self-obsessed in belief that it (they, we) own truth-understandings in a way no other religion (church, people) does. We vigorously assert we are exclusively correct in our 'owning the Light of Truth', that is, we arrogantly affirm we are the TRUE 'Lucifers'. Hmmm.