I wish we could just control/organize our memories, pick and choose, to save, delete, restore, or even keep some of those (we don't want them to wildly pop up) separately and stick it in only when wanted or needed....
Stick it in only when needed... hmmmmm... I think you may have the next "just say no" campaign at you fingertips!
Know this for sure... if you try to say something nice, or try to do the right thing in a bad situation, then in your memories you also know you did your best, and that's a good memory to have attached to the bad ones.