The problem is that when public figures openly flaunt their Catholicism, yet openly reject certain basic tenets of the faith, it causes scandal and confusion. Chaput is trying to discuss the causes of confusion - - the public figures have brought it on themselves, I think...
Parable of the 99 sheep simply doesn't apply here, I'm afraid, unless the lost sheep says "Well, I don't want to be with the other 99 bigoted deplorable homophobe sheep"...