As we commemorate the 20th anniversary of 9/11 during the Days of Awe, Donniel Hartman, Yossi Klein Halevi, and Elana Stein Hain take stock of how American and Israeli reality has been shaped by the tragedy and the wars that followed. Yom Kippur is a summons to examine our mistakes and begin anew. What were the missteps after 9/11 that all of us, regardless of our politics, need to examine together?