Against the background hum of the convention center, Dar Leaf settled into a club chair to explain the sacred mission of America’s sheriffs, his bright blue eyes and warm smile belying the intensity of the cause. “The sheriff is supposed to be protecting the public from evil,” the chief law enforcement officer for Barry County, Michigan, said during a break in the National Sheriffs’ Association 2023 conference in June. “When your government is evil or out of line, that’s what the sheriff is there for, protecting them from that.”