There is something infinitely naive in our pursuit of the identity of those behind the massacres which Isis is committing in Europe. Yes, we need to know the names. Sure, we need to know what their wives or parents thought. Did they know? How did the perpetrator of Monday’s Berlin truck killings communicate with Isis? Or did he merely imbibe their political instruction manual? After the Bataclan mass murders and the lorry slaughter in Nice, we asked the same questions.So now we ask: is the latest suspect – a Tunisian criminal Anis Amri – the killer driver of the Berlin truck?