Latest "VA scandals" stories
Veterans who participated in the event said they were given little or no warning about potentially traumatic discussion points.
The groups' say they have lost faith in the ability of VA Secretary Robert Wilkie to lead the department.
The report accuses senior officials of ignoring problems within the department to pursue political vendettas instead.
Families still don't have a motive for the crimes or answers on whether proper hospital safety protocols were in place.