Because men are the ones left out of the abortion decision and they need to assert themselves as protectors of their children, protectors of families just as St. Joseph gives such a manly example. Allowing men to form their own group is an excellent and wise decision. Maybe men who experienced abortion in their lives as boyfriends or husbands will feel more confident to speak about their feelings and have rapport with other men in the same plight.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.