Northern Ireland Offers a Warning That Few Are Hearing

BELFAST—I’m driving across Europe’s most divided city, where politics is existential and fear often only a few streets away. Sitting beside me in the car is someone who describes himself as “an active loyalist”—loyal to the British Crown and state and opposed to a united Ireland—but, like other unionists I spoke with, asked not to be identified for fear of retribution. In loyalist parts of Belfast, they are determined to show he has no mandate from them.