In the case of Rotherham, I believe that most of those committing the crimes were not foreign; most were British born British nationals. Ethnicity is not the same as immigration status.
Congratulations, you've corrected us on the usage of the word immigrant. Now can we return to the topic?
Whilst we're on Rotherham:
"...by men predominantly of Pakistani heritage" [0]
https://www.bbc.com/news/uk-england-south-yorkshire-61868863
Their parents or grandparents were immigrants...
The question is: Would the crimes have been covered up by authorities if the predators were ethnically English and the victims were children of foreigners?