This quote summarizes any veteran with PTSD. It’s easier to remember your friend who died in a mortar attack–the smell of their blood, the feeling of them in your arms, their look on their faces, the sound of their dying breaths–than it is for a person to remember their high school sweetheart, or a good time camping with friends.
This is one of the reasons I think veterans suffer from PTSD. Because it’s easier to remember the bad. There are no scars for happiness, but there are scars from mortar attacks and firefights–physically and mentally.