The UK awoke this week to news stories of demonstrations and agitation in the capital alongside a review of the overrunning and overspending on the HS2 rail project. These seemingly disparate stories tell another story, however, when linked together. In part, the reason we have creaking sclerotic bureaucracy capable of blowing £100bn on – well, it is hard to say what exactly is being delivered in return – is the same reason extremist groups are able to galvanise large number