If Gosnell was an outlier then why were various abortion clinics referring patients to him?

Here's a must watch interview with Desiree Hawkins, a former patient of Kermit Gosnell who had a late-term abortion at his clinic when she was 16.  She was referred to Gosnell by the Hagerstown Reproductive Health Services abortion clinic.  Hagerstown Reproductive Health Services is accredited with the National Abortion Federation. 

In the movie, Desiree even shows the abortion clinic pamphlet where Gosnell's name and number were written.  From the testimony of Karnamaya Mongar's relatives, we also know that a D.C. abortion clinic referred patients to Gosnell. 

While the abortion industry and their loyal advocates continue to blame Gosnell on prolife laws and abortion restrictions, I've yet to see one abortion advocate come to grips with the reality that various other abortion clinics were referring patients to Gosnell.  In all likelihood, hundreds (maybe even thousands) of women (many from out-of-state) went to Gosnell not because of prolife laws but because they were referred there by other abortion clinics who didn't do abortions past a certain point.  Desiree Hawkins would have never heard of Kermit Gosnell, went to his clinic, and had the foot of her child stored there if she wasn't referred to him by a NAF clinic.