After seven weeks held hostage in the tunnels of Gaza, they are finally free to laugh and chat and play. But some of the children who have come back from captivity are still reluctant to raise their voices above a whisper. In theory, they can eat what they want, sleep as much as they choose and set aside their fears. In practice, some have had to be convinced there’s no longer a need to save a cherished bit of food in case there is none later. At last, the 86 Israelis released during a short-lived truce between their government and...