Penstemmon
If you read my posts you will see that I agree with your 2nd paragraph and have made similar comments, because that is a fact, probably made more references to 'groups' of paedophiles and included the church, the establishment, children's homes etc. and certainly addressed ethnicity by broadening it to Asian, White, Black' Chinese and so on.
You say in your last paragraph 'The shock about this case is not so much the ethnicity of the perpetrators etc.'. This is still trying to lesson the fact that "in this case, Rotherham' which this thread is about , the fact is there was this particular group of paedophiles who share a common background.
Example, next week there could be a thread on a paedophile ring in the church, that would no doubt be about white ethnicity. If anybody tried to say 'Yes well Asians do it too you know' I would make exactly the same comments but it would be saying, 'don't try and play a race card because this particular paedophile group are from a prodominently white, christian background, because that would also be a fact.
I hope that makes sense. Try and watch the Child Sex Abuse Question to Theresa May that took place today.