Open up Washington, D.C.

Shut it down and close it up. That seems to be the default reaction of the Secret Service to any problem in protecting Washington, D.C., buildings. The bunker mentality has turned the nation’s capital into a place of unsightly bollards, barriers and guard booths. Last week it struck again.

The loss this time is not just of access to a sidewalk that offered a glorious view of the White House but further erosion of the openness that is — or should be — a hallmark of American democracy.

As of 11 p.m. Wednesday, by decree of the Secret Service, members of the public were barred from the sidewalks along the south fence of the White House between West Executive Avenue and East Executive Avenue. Since 2015 similar restrictions had been in place overnigh, but during the day visitors could still enjoy a classic view. The vantage point was hardly close to the White House, but it was a favorite spot for thousands of visitors to take a picture and hope for a glimpse of someone famous or powerful on the distinctive portico.

The Secret Service faces enormous challenges to protect the nation’s leaders and historic structures in difficult times. But for all the talk about a careful balancing between openness and security, who speaks for openness each time one of these internal debates takes place? Fear and convenience seem to win out. It also seems that new curtailments on the public follow instances in which the Secret Service is embarrassed by security lapses such as last month’s incident in which a man scaled the fence and roamed undetected for nearly 17 minutes while President Donald Trump was inside the White House.

A new, taller — and presumably harder-to-scale — fence is in the works for the White House. We support that project. Logic might suggest that, once it is in place, some access might be restored for the public. But don’t count on that. Once put in place, security measures generally stay forever.