"No-go zones" na Europa?

A respeito das notícias (ou, talvez mais corretamente, observações de passagem) da Fox News de que haveria em França e Inglaterra "no-go zones" islâmicas, onde a polícia não entrava e vigorava a sharia, o insuspeito John Derbyshire (no site anti-imigração VDARE):

On January 10th, the Saturday following the Charlie Hebdo massacre, terrorism expert and author Steve Emerson was on the Fox News program Justice with Judge Jeanine. Discussing the situation of Muslims in Europe, Emerson said the following thing:

In Britain, it’s not just no-go zones. There are actual cities like Birmingham that are totally Muslim, where non-Muslims just simply don’t go in.

That was an unfortunately absurd thing to say. In the 2011 national census 22 percent of Birmingham’s inhabitants identified as Muslim, 46 percent as Christian, 32 percent as other religions or none.

Birmingham is Britain’s second most populous city at 1.1 million. The municipal boundaries encompass 103 square miles, putting Birmingham midway in size between Sacramento and Salt Lake City—but in, of course, a much smaller country. For non-Muslims to be excluded from a place that size would be astounding. (...)

These two little episodes generated much comment and analysis, of quality both high and low, on the whole subject of no-go-areas and local enforcement of shariah law in European cities.

As best I can judge after a couple of hours reading through this material, the stories about no-go zones are somewhat overblown. The famous French government list of Zones urbaines sensibles (sensitive urban neighborhoods), for example, marks these neighborhoods as prioritized for slum clearance. No doubt they are bad areas with a lot of crime and vandalism, and predominantly African and/or Muslim; but I can’t find any evidence that police stay out of them. (...)

The police chief mentioned by Governor Jindal was not describing no-go areas so much as never-called-to areas:

There are cities in the Midlands where the police never go because they are never called. They never hear of any trouble because the community deals with that on its own … It’s not that the police are afraid to go into these areas or don’t want to go into those areas,’ he said. ‘But if the police don’t get calls for help then, of course, they won’t know what’s going on.

[Murders and rapes going unreported in no-go zones for police as minority communities launch own justice systems, by Sara Smyth; Daily Mail, January 17, 2015.]

Deplorable enough, but not unknown in the British slums long before mass Muslim immigration. [Where ‘Say Nothing’ Is Gospel, I.R.A. Victim’s Daughter Is Talking, By Katrin Bennhold, NYT, May 21, 2014] The chief also told the Daily Mail that attempts to enforce shariah law don’t go unpunished:

Last December, three members of a self-styled ‘Muslim Patrol’ vigilante group were jailed for harassing, intimidating and assaulting people in East London while claiming they were enforcing sharia law.

And plainly the police had gone into the area to make those arrests.

Prof. Daniel Pipes, who believes he coined the phrase “no-go zones” in this context in 2006, has since backed away from it.

[Derbyshire acha que as pessoas que falam em "no-go zones" estão erradas na descrição mas certas na tendência]