At the same time as it was handing over Israeli hostages, Hamas was this week undertaking another task at the core of its survival strategy – visibly deploying armed fighters and police across parts of Gaza. The show of strength was interpreted by some, among them Donald Trump, as a necessary – if temporary – step to prevent the territory dissolving into anarchy as a ceasefire takes hold. However, the Islamist militant group behind the massacres on 7 October 2023 seemed to be wasting no time in seeking to reassert its authority amid the ruins of Gaza, claiming it was...