How politics may destroy the efforts law enforcement have made that have prevented terrorist attacks in the US.

Ron Haddad is Dearborn’s chief of police, and he says he gets one question a lot when he travels around the country. “Someone will come up to me and put their finger in my face, and they’re already angry,” he says. “They say, ‘Will the people in your community report acts of terror to you?’“

What they mean is: Will Muslims turn in other Muslims?

Haddad has a ready answer. “Not only would they, they do,” he says. “They’ve done it.”