I think Archbishop Chaput's point is that the shepherd in the parable goes in search of the lost sheep and brings it back to the flock. He doesn't announce, "OK, flock, everybody may go off as far as he likes in any direction he likes. Don't talk to me about wolves. Wolves are just a silly old Jansenist myth designed to spoil sheep-fun. This flock needs to redefine the concept of wolf. Protecting sheep against wolves is not at all inclusive. Good shepherds should welcome wolves to come hang out with the flock."