Rape of a Nun in Kandhmal

The nun who was allegedly raped in Kandhamal in Orissa came before the media on 24-oct and recounted her trauma, which is understandable , but unwilling to cooperate with the Orissa police to identify the culprits is shocking, The SC has already rejected CBI probe into the incident. If every victim wants a CBI probe , then why do we need a police force (A waste of Manpower and money?).
I understand that some people in the police force did not help her in the hour of need, even so, blaming the whole police force is not some thing which is acceptable.