"What we are fighting, in Islamist extremism, is an ideology. It is an extreme doctrine. And like any extreme doctrine, it is subversive. At its furthest end it seeks to destroy nation-states to invent its own barbaric realm. And it often backs violence to achieve this aim – mostly violence against fellow Muslims – who don’t subscribe to its sick worldview. But you don’t have to support violence to subscribe to certain intolerant ideas which create a climate in which extremists can flourish. Ideas which are hostile to basic liberal values such as democracy, freedom and sexual equality. Ideas which actively promote discrimination, sectarianism and segregation. Ideas – like those of the despicable far right – which privilege one identity to the detriment of the rights and freedoms of others. And ideas also based on conspiracy: that Jews exercise malevolent power; or that Western powers, in concert with Israel, are deliberately humiliating Muslims, because they aim to destroy Islam. In this warped worldview, such conclusions are reached – that 9/11 was actually inspired by Mossad to provoke the invasion of Afghanistan; that British security services knew about 7/7, but didn’t do anything about it because they wanted to provoke an anti-Muslim backlash. And like so many ideologies that have existed before – whether fascist or communist – many people, especially young people, are being drawn to it. We need to understand why it is proving so attractive."