Stockwell Day, the Conservative cabinet minister who is being skewered for his answers today to questions about the government’s plans to spend billions more on new prisons, when police-reported crime rates are declining, got something dead right. Day was bang on when he said lots of crime goes unreported. That’s wholly, completely, totally accurate. The problem is, unreported crime has absolutely nothing – nadda, zippo, zilch – to do with plans to build more prisons and lock up more people for longer sentences. And that’s Day’s big problem, because he drew a big, fat intersecting line from one to the other, as if they were shadow and shape in a kid’s activity book matching game.