When I asked Robert Spitzer about the possibility that he'd inadvertently created a world in which ordinary behaviours were being labelled mental disorders, he fell silent. I waited for him to answer. But the silence lasted three minutes. Finally he said, 'I don't know.

My ideal world was the early days of Twitter, where everyone was curious about each other and everyone saw it as kind of a window into people's lives where we could be compassionate and curious and empathetic and we could tell each other secrets.

I am the neurological opposite of a psychopath, in that I feel anxious almost all the time. It must be great to not constantly feel like you’ve got someone living inside your face, shooting you with a mini Taser.

As I glanced at the phraseology of the research report, dull and unfathomable to outsiders like me, I thought that if you have the ambition to become a villain, the first thing you should do is learn to be impenetrable. Don’t act like Blofeld—monocled and ostentatious. We journalists love writing about eccentrics. We hate writing about impenetrable, boring people. It makes us look bad: the duller the interviewee, the duller the prose. If you want to get away with wielding true, malevolent power, be boring.

The snowflake never needs to feel responsible for the avalanche.

No, people back home don't realize why there is this kind of need for heroes in America at the moment. People in Britain don't really understand what's going on here. They don't understand why Camp X-ray exists.

I wondered if sometimes the difference between a psychopath in Broadmoor and a psychopath on Wall Street was the luck of being born into a stable, rich family.