On Saturday morning I saw a Fox News anchor tell former US diplomat John Bolton that Norwegian police were saying this appeared to be an Oklahoma-style attack, then ask him how that squared with his earlier assessment that al-Qaida were involved. He was sceptical. It was still too early to leap to conclusions, he said. We should wait for all the facts before rushing to judgment. In other words: assume it's the Muslims until it starts to look like it isn't – at which point, continue to assume it's them anyway.