This article framed it better than me.
The reasons for refusing a government intervention can be disputed, but it cannot be disputed that it is reprehensible. The case for a centralised inquiry is clear: while this request was for Oldham alone, there has been a rape gang scandal in over 50 British towns and cities. This is a staggering scale of depravity, and most cases are marked by close resemblances in their systematic nature. The demographics of the rapists are often disproportionately men of Pakistani origin and their victims are particularly vulnerable young girls, often in social care. There have been large-scale cover-ups within ethnic communities, social services, police forces and council authorities.
Politicians have taken to passing laws named after victims — such as Martyn’s Law, Clare’s Law, Harper’s Law — to ensure the often appalling and nightmarish circumstances of their deaths never happen again. By contrast, it seems like politicians cannot wait to forget the victims of Britain’s grooming gang epidemic.
While there have been isolated inquiries, such as the Jay Report and a 2013 report by the Home Affairs Committee, these have not provided sufficient answers. But a report solely into the events in Oldham will arguably suffer from the same issue, as will any report provided by a council reporting on its own conduct. Given that many of those involved may still be serving, it will be difficult to name the individuals at fault.
Rather than treating each gang as a separate problem, the Government should launch an inquiry that deals with the disturbing phenomenon as a whole. It should treat this as what it is: a national problem, not isolated incidents. It should provide the resources, authority and backing necessary to deal with the crisis as such and tackle the institutional cover-ups which happened time and time again, regardless of the council area responsible.
https://unherd.com/newsroom/why-is-labour-rejecting-a-national-grooming-gangs-inquiry/