Well, if I'm honest, I'm also still a bit angry that I am put in the position where I have to justify my actions as D4's parent while STBXW walks out the door and can pretend she has her best interests at heart. I did have to resist defensiveness/justifications.
Completely relatable.
Think of the criticism of your parenting just like the criticism of you as a H. Stay true to your values, and do what you think is best for D4. There's no need to defend. Your W thinks exiting the MR was best for D4. She has different feelings than you.
It's good to acknowledge your anger. You would be a heartless robot if you weren't angry.