In this case, organized rape was effectively unpoliced for some time to avoid "community tensions" with police saying the children involved "were slags". The message should be sent that organized crime will now be prosecuted.
The ethnicity of the more recent perpetrators just provided another excuse. It wasn't the root cause of the inaction.
Yes, it really is that simple. I can leave my laptop unattended in an unlocked coworking space in Singapore because people know they'll be punished if they rob me. It's marvellous.
I haven't heard of a similar case of organized mass rape in the UK before this, so it's surprising to read you comment, but if you have sources add them here. Like many of the UKs (and Europes) problems, the issue isn't ethnicity, but rather Islam, which explicitly permits sexual slavery.