On Sunday morning 10 Egyptian F16s flew low over Tahrir. The military was putting a third layer on to a cement wall barricading the presidential palace. A spokesman for the Salafist al-Nour party announced that "if Morsi is endangered or assassinated there will be an Islamist revolution for full Islamist rule in Egypt". An atmosphere of danger and crisis is being created. But it has never been the secular – left or liberal – forces in Egypt who have gone in for cold-blooded murder. If I were Morsi I'd watch my back.