“When evil gets around, it turns the world upside down,” says David Barr, a British-Israeli teacher of Jewish philosophy. His family’s life was turned upside on October 7th when Hamas stormed the kibbutz where he lived in southern Israel near the Gaza border. Soon afterwards, up the road in Sderot, Hamas gunmen murdered his wife’s sister, Naomi Shitrit, as she went on her morning run. Naomi’s body was identified four days later. They had a quick funeral followed by shiva, the traditional week of mourning. “But who do you mourn for when there is so much evil, so many people...