It can also be tempting to think, especially in a media and online culture that so disdains politicians, that the MPs have learnt nothing from the experience. From Afghanistan to Iraq and Libya to Syria, MPs have had to grapple with the risks each time. Technically, the military answers may have been very different in each case — ground forces in Afghanistan and Iraq, air power in Libya, staying at home over Syria. Yet none has worked, and still the problem returns fully charged, as it has now done for a second time in Syria.