"Although they don’t go over it in the interview, what if one of these people had a tragic occurrence in their life, for example they lost a child. They essentially would be haunted by that memory everyday an unable to move past it like the majority of us can. Perhaps there is a reason why we shouldn’t remember everything that happens to us. Maybe we evolved in order to forget things because the majority of life is tough."
I don't think these things are traumatic or not traumatic based on remembering the details. The event still happened to you and had some impact even if it's buried in the subconscious.
To me it seems remembering the details could only help, it sort of gives more dexterity if you want to cope and sort it out.