I do think human memory is finely tuned and aligned with our evolutionary journey.

Retention of traumatic memory is actually an evolutionary edge we have..if you don’t retain that memory, we will keep repeating the same fatal mistake again and again.

I would even go further and look into studies re amygdala and how it works with people who have substance abuse or addiction issues.

Suicidal tendencies have to do with brain chemical imbalances and not necessarily with the formation of long term and short term memory.