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It is generally thought that people recover from trauma when they are able to process what has happened, reach a point of closure and move on. So, suppressing what has happened (sweeping it under the rug) or trying to ignore or forget what happened (I think this is what you mean by 'letting it go') is thought to be potentially problematic as traumatic memories have a tendency not to go away. We see people many years after a traumatic event continuing to have nightmares, flashbacks, anger problems, depression and a whole range of traumatic symptoms while they try very hard to forget, suppress or ignore what happened.
There are exceptions (some people appear to cope very well with suppression) but regardless it sounds very much like letting it go is not working for you at this time. It is completely natural to want accountability is this is something that can't be achieved through letting it go. Self esteem problems and feelings of worthlessness are very common to victims of trauma, feeling like you are not holding people accountable is only going to make these feelings worse.
If you are interested in pursuing trauma therapy let me know as I ca make some suggestions on how best to go about this.