It's shocking, but sadly doesn't surprise me. When you can get done for assaulting someone who has broken into your house, then police taking the word of some thug really doesn't shock me.
We have some real idiots for police round here too. Motorists are their favourite target. A classic incident was for my brother. He used to work the door of a nightclub and a girl he knew was away to walk through the town centre to get home. For her safety, he said he'd give her a lift. The road that she lived on was a road for buses and taxis but not for ordinary cars. It was three in the morning and other than drive the entire way round the town centre to get into the street when her house was actually only about 50 yards round the corner, my brother just turned the corner. A police car behind him drove past an almighty big fight that was going on outside the kebab shop to pull him and do him for being where he shouldn't have been. I know he shouldn't have went into the bus/taxi bit, but surely with a bit of common sense at that time of the morning and the fact that there was a big fight going on the police should have prioritised!
Kids nowadays are too good at shouting about their human rights and how you can't do this to them and you can't do that to them. A cuff round the ear never did me any harm when I was a kid.