The Israeli military campaign in Gaza, experts say, now sits among the deadliest and most destructive in history. In just over two months, the offensive has wreaked more destruction than the razing of Syria’s Aleppo between 2012 and 2016, Ukraine’s Mariupol or, proportionally, the Allied bombing of Germany in World War II. It has killed more civilians than the U.S.-led coalition did in its three-year campaign against the Islamic State group.