Ok, had you opened with such an explanation, rather than making a hyperbolic, unsupported claim using sensationalist, poor credibility, cherry picked articles then this thread might have gone a lot better.
If you're suggesting that the police are underfunded and thus facing difficulties in keeping up with an increasing array of challenges, being additionally hampered by changes in political will and social changes? Not only might you have an argument, I might even agree.
However some of your claims, such as no-go zones and all Muslims being exempt from the law, are so utterly incorrect that it completely undermines any related discussion and makes it very difficult to view seriously any genuine points you might have.
There is nothing special about the Muslim communities in Britain, they have the same problems and challenges as policing many other types of communities, whether geographical, religious, ethnic etc. That isn't burying head in the sand, that's reality and there are plenty of other things to deal with too, some of which are of far greater impact.
You are correct that one size fits all policy wouldn't work for policing. Which is why we have lots of different departments and escalating levels of action. There are no places that police won't go, but there are areas that an officer might not go until they have back up. That isn't cowardice, that's sensible. As a copper I didn't go onto a traveler site by myself unless I wanted my head kicked in. But we had liason units that got to know them and worked with us to follow up any enquiries, so it wasn't an issue. When we did need to go there, we could have a riot van sat behind us, making clear what co-operation was desired. If it was really needed, regardless of the subject, we can turn up with a hundred officers, Dog units, Armed Response, Air Reconnaissance etc. We have officers who can deploy in urban assault situations carrying appropriate weapons, we have police snipers, water cannons, armoured vehicles, CS Gas launchers, baton rounds, melee weapons, specialist support vehicles etc. We can work with Military police where appropriate, if a situation really needed it such as one of these supposed 'no-go' zones would be, than we'd have the support of the armed services, including one of the most hardcore special forces units in the world...
It's been done before. It's not because there isn't a will to do what is needed, but because it simply isn't necessary that often.
The characterization of the UK you created by cherrypicking a few sensationalist articles or radical personal opinions, is pure fantasy.
Amongst the various challenges facing the UK police today, Muslim communities, diversity issues and immigrating communities of any other sort, are not especially the problem. Identity Fraud and the rapid increasing of CyberCrime as a whole vastly outstrips the resources needed for tackling religious or racial groups. Hell, the increasing pressure on Traffic and Highways meant they had to create an entirely separate civilian force to help out and it still takes up huge resources in comparison, let alone worrying about Terrorism, Domestic Violence, human trafficking etc.
Policing is a complex set of issues and there are problems for sure. Trying to pin all of them on a single group or even multiple groups, fails to understand the complexity of society, lawmaking, policing or, frankly, reality.
Rotherham was horrific. No one would deny that or deny that serious mistakes were made. The reason you've heard of it however, is because it led to a massive investigation, was widely publicized and followed up on for years. It resulted in changes to policy and procedures, for the police, for councils, for courts. No one buried their head in the sands about it this time. It resulted in a fair number of convictions, some for more than 25+ years each. No idea if any of them were Muslims but they definitely weren't exempt from the law.It was an awful incident, but doesn't support your argument in any way.
It was also quite a while ago, yet the 'Muslim gangs' have spectacularly failed to take over in the meantime.
You are right that different approaches are needed in different countries, for a wide variety of reasons, far more than just questions of 'Diversity'. The obvious comparison is the UK and USA.
Both White Dominated countries, sharing a common language, related histories, high level of cultural exchange etc. But I agree that UK style policing would likely be ineffective, even dangerous, in parts of the USA. Equally the USA approach would be worse than useless in the UK, it would result in a lot of unnecessary deaths, including a lot more dead police. However the appropriateness of each style has nothing to do with the diversity of each country, on the contrary it is very much down to certain characteristics of the dominant culture, which is rather white centric on both sides.
If you want to discuss any of the genuine issues in the UK, or the police, I'd be happy to do so and I'm sure most others would too. Just please dial down the melodramatic rhetoric, and it might be a lot easier to have a genuine discussion.