Margaret Sanger and her views are far too complex to receive a shorthand treatment here or anywhere else. While I couldn't care less whether there are Catholic Girl Scouts, I very much care that women in general, and Catholic women in particular, have access to contraception and reproductive health care without interference from the church or ideas imposed on them by people who have no stake in the issue. 
In this case, the girls excluded from Girl Scouts will now grow up alienated from their church and wondering whether their bishops have anything more than a skewed view of sexuality to offer.  Instead of addressing this issue with adults who could challenge his views, the bishops picks on vulnerable young girls, which is going to yield the same results for the church as eugenics did for society.