No, the real reason we ignore the vandalising of so many Muslim sites is that we cannot – will not, must not – criticise the Saudis whose grotesque wealth silences all of us to such obscene lengths that our Prime Minister flies our flags at half mast when its autocratic ruler dies. No suggestion must be made – not even the softest whisper must be uttered – that might connect our Saudi friends with the apocalyptic cult called Isis, which follows with absolutist determination the Wahhabi Sunni faith adopted 270 years ago by the ancestors of the present Saudi monarchy.