In fact, this may be a path only a lame duck could risk. The politically easier path is to promise “never again.” As Trump’s hard-line rhetoric about the president being weak on terrorism demonstrates, Obama and anyone who follows him and tries to continue on that path will be an easy target for opponents who will claim that transforming homeland security from the fantasy of never-again prevention to a combination of prevention and mitigation and recovery is throwing in the towel. That this is still a debate in an election season 15 years after the 9/11 attacks is evidence that although we’ve made progress, we’re still a long way from adjusting—politically and psychically—to this new normal, where, unlike during the Cold War, there is no relying on deterrence for protection.

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