The takedown of Jason Arday has overjoyed the right, and must be a wake-up call for the left

'To be honest with you, I thought you'd just believe me." That was the breathtaking response of Prof Jason Arday when the Guardian interrogated the details he provided of an alleged racist campaign of intimidation against him, which involved a severed pig's head, a masked man wielding a knife and bullets in the post. Arday had been unable to provide evidence, and when the Guardian contacted the relevant parties, including a south London butcher and the police, his claims were either refuted or could not be verified.