Since Oct. 7, 2023, Hamas sympathizers have insisted that we must understand the massacre in its historical context — that it did not happen in a vacuum. This much is true. To understand this context, we need to look back at a chapter of history that predates the state of Israel by two decades. That chapter is 1929. On Aug. 24, 1929, more than 3000 Muslim men armed with swords, axes and machetes marched through the ancient Jewish quarter of Hebron, then part of British Mandate Palestine. That Sabbath morning, they slaughtered 67 Jewish men, women and children, and wounded...