My experience with abusers taught me that you have to keep track of what *really* happened, because once you are far away from them, in the broad light of day, you may start to wonder "was it really that bad?"
So you have to keep alive some part of the memory. You have to make a pact with yourself to remember what you know: yes, it was horrific.
The same applies culturally. If we ever do see a better day (I believe we will), we must not allow ourselves to forget that it was in fact "that bad."