Science has been corrupted. I hate to say it, but it’s the only conclusion I can reach after months of researching cousin marriage — a ban on which was debated in parliament last week. It’s been a period of frustration, obfuscation and institutional omerta: the antithesis of the open inquiry described so eloquently by Plato and Popper. Let me start by telling you about Dr Patrick Nash, a somewhat shy legal academic who in 2017 came across an intriguing finding. He noticed that much of the “extremism” emanating from Pakistani communities seemed to have a “clan” component. The perpetrators were...