Hamas’s sneak attack over the weekend was Israel’s Pearl Harbor. For far too long Israelis have clung to the belief that it is possible to coexist with a neighbor like Hamas, a genocidal terrorist organization whose founding charter calls for Islam to “obliterate” Israel and to serve Allah by “killing the Jews.” Now, reeling from a barbaric slaughter unprecedented in their country’s 75-year history, Israelis know better. It took a deadly attack on Pearl Harbor on Dec. 7, 1941, to finally propel the United States into World War II and shake millions of Americans from the delusion that neutrality was...