Searching for a single partisan motive among perpetrators of political violence is likely a fruitless exercise.

I do feel much more sense of hopefulness that both sides have learned what losses are entailed by this kind of war, and that it might be time to turn the page.

Those partnerships and alliances that we have, they need to be updated too—they need to be updated for a new era, a new balance of power, and a new threat environment.