
Most of the Britain is still overwhelmingly white and non-Muslim. When you read about the UK and parts of it turning into a Sharia law hellhole, you are talking about parts of London - which already experienced 'White Flight' to Essex as early as the mid-1960's as well as Leiecester, Birmingham and such places, they are bigger, inner city areas. Go to a city like Sunderland or Hull and you will hardly see a black face, never mind a Muslim.
The reason why you can't go on a Roosh style crusade is because women will just tell you to f**k off. And if you hang around a park or a high street stopping women by trying your Roosh lines then some White Knight is going to come over and belt you one. You can go and do it in the whitest part of the country (and that is a lot of places to choose from).