Commentary: Here’s what Trump doesn’t know about knives, guns and murder

Many in Britain took great exception to President Donald Trump’s comments about the rash of knife attacks and murders that have plagued London in recent months. Speaking to the National Rifle Association’s annual convention last week, Trump called back to an old NRA talking point when, after noting Britain’s “unbelievably tough gun laws,” he added: “They don’t have guns, they have knives and instead there’s blood all over the floors of this hospita