Some wounds stay open because blame keeps touching them.

Blame keeps a wound in the present tense. Every time you return to who did this, you handle the injury again, and the handling prevents the closing. It feels like justice, and sometimes the anger is entirely warranted, but warranted anger and healing are not the same process and they do not run at the same time.

Without excusing anyone, try giving the blame less of your day. Set it aside for a defined period rather than forever. See what the wound does when it is not being touched, and let that tell you something.