Rishi Sunak has a problem. A chunk of the Conservative party membership is angry with him for precipitating Boris Johnson’s fall. Another group cannot understand why, if Boris was so unworthy, Mr Sunak did not quit earlier. There is, of, course, an answer which covers both points. In an economic crisis, the Chancellor has a duty to stay at his post for as long as he can. So for many months, Rishi Sunak put up with hostile briefings from No.10, not to mention the PM’s unfocused approach to economic policy, until the PM’s ultimate moral implosion. In both staying and leaving, Mr Sunak can claim to have done the right thing.