I understand the outrage at the neighbours who stayed silent but to an extend I understand it. When I was 23, I will living alone in a flat in Cape Town where I shared an entrance with the neighbouring flat. In the neighbouring flat lived Nigerian pimps / drug dealers and a lady who I presume was their Madam. And they used to hurt her - often - and most of the time I was genuinely too scared to call the police. They would have known it was me since I was the only one who shared any walls with them (due to the layout of the flat). I also had nowhere else to move to and I remember being genuinely scared of them. They had those dead eyes, ones that pierce straight through you and yet have nothing behind them. I did eventually call the police - one day when the screams were such that you physically couldn't ignore them (I think they were burning her with hot oil). The police came, they left and I high tailed out that very evening never to return. No major point to this other than I understand how neighbours can be scared of retaliation.