
Less frequently written about is the way in which trauma can reach back behind the traumatic event itself and devalue past good experiences, experiences of attachments met and love acknowledged, experiences that preceded, often by decades the traumatic event.
These observations about trauma are best suited to explaining adult-onset trauma. It need not be the trauma of a single incident, it could be an experience as extending over years, but I assume that before the trauma there were good experiences, and good memories. These good memories are not forgotten, but too often they become unavailable as an emotional resource to be drawn upon when times are tough.