South African Police: Authorities or Vigilantes?

I recently read an article about reports police abuse in South Africa. The article, from UK newspaper - The Guardian, used a website called South Africa's Independent Police Investigative Directorate (IPID) to show a number of violations of people's rights by South African Police.

Within a week of each other two constables appeared in court facing charges of rape. The first appeared on February 21, where it has been reported that he raped his former girlfriend after driving her and some of friends home from a tavern. They were using a state vehicle and after dropping off the friends, the victim was let outside the vehicle to pee. Allegedly there was "a chase", and afterwards the victim was assaulted, raped, and was threatened with death when she refused to get back in the car.

The second victim had been arguing with her sister prior to the police being called. The police handcuffed and brought the woman to a field where the constable allegedly raped her. The accused is out on bail for R1,500, or £150 ($225).