The authors suggest to introduce an extra field in death certificates indicating if it was a medical error, but the responsible parties may not acknowledge mistakes for fear of malpractice suits.
Accountability is part of life for everyone; even somene merely licensed to drive goes to jail for hit and run. Accountability is especially to be expected if you are a professional, and especially if you are given the status and pay that goes with holding others' lives in your hands.
Not taking responsibility in these situations should be acrime, IMHO.