“Its detractors loathed it, and even its fans would agree that its anti-hero, Patrick Bateman, is one of the most unsavoury creations in literary history. So what does it say about us that we’re now willing to whistle along to his depravity? Have we inched closer to Bateman’s way of thinking over the past 25 years? Or has the story told in Ellis’s novel been diluted with each subsequent retelling? The answer is somewhere in between.”