The Secret Service is scandal prone. It spends excessively on foreign presidential trips, and it has agents who get in trouble with prostitutes and liquor bottles. The recent White House fence-jumping incident was a stunning failure. Despite the Service spending $1.9 billion a year, a guy with a knife jumped the fence, sprinted across the lawn, pushed open the front door, galloped through the Entrance Hall, danced across the East Room, and almost had time to sit down for a cup of tea in the Green Room.

In the wake of the incident, the head of the Secret Service resigned. But the Service is an agency within the Department of Homeland Security (DHS), and the head of DHS, Jeh Johnson, did not resign. Indeed, he said very little about it, presumably to evade responsibility. So what is the purpose of having the DHS bureaucratic superstructure on top of agencies such as the Secret Service? If DHS does not correct problems at agencies when they fester for years, and if DHS leaders do not take responsibility for agency failures, why do we need it?

A new survey of 40,000 DHS employees reported in the Washington Post finds that the department has severe management problems:

The government’s 2014 Federal Employee Viewpoint Survey portrays a Department of Homeland Security still facing debilitating morale problems that have plagued it for years but worsened during the Obama administration — and which have grown more serious since Johnson took over in December.

While the survey shows that the vast majority of DHS employees are hard-working and dedicated to their mission to protect the homeland, many say the department discourages innovation, treats employees in an arbitrary fashion and fails to recruit skilled personnel.

At the DHS Science and Technology Directorate, for example, only 21 percent of employees in this year’s survey held positive views of their leadership’s ability to “generate high levels of motivation and commitment in the workforce,’’ according to results for that division.

Since its inception, the department has been plagued by poor morale and a work environment widely seen as dysfunctional, which has contributed to an exodus of top-level officials in recent years, many of whom have been lured by private security companies.

Only 41.6 percent of DHS employees said they were satisfied with the department, down from 44.4 percent a year earlier.

In 2013, only 29.9 percent of employees department-wide had a positive view of their leaders’ ability to “generate high levels of motivation and commitment in the workforce.’’ That number plunged to 24.9 percent this year.

That’s all pretty pathetic. But this is the most stunning result from the survey: “Asked if their leaders ‘maintain high standards of honesty and integrity,’ just 39.1 percent of employees responded positively.”

The 2002 creation of DHS was a mistake. Congress should revisit its handiwork, and begin unbundling the department and closing it down. Some DHS agencies, such as the Secret Service, should be stand-alone organizations that report directly to the president. Some DHS agencies should be moved to existing departments. And some DHS agencies, including TSA, ought to be abolished.