I think it's also important not to rewrite history. That's what the MLCer does. You don't have to figure out every bad thing in the past, just heal yourself and find that freedom and peace. (I am the first to admit that that is the hardest thing ever!)
Chump Lady calls that ‘untangling the skein’. You’re right, it’s not necessary. She says the goal of detachment is ‘meh’ and I think I’m close to that place. I can reflect on the past without getting hung up on it.