Burke's motivation is that he likes to tell people they cannot receive Communion.  That is the motivation of many of the people so obsessed with this.  They view the Catholic Church as their country club and don't want the riff-raff to think that they've been invited to the club.  These are also the same people who treat the parish as their own little sorority and get in catfights about the parish bake sale and picnic and write letters to the chancery about the Advent Reconciliation service and liturgical dance.