What is the practical takeaway for "normalization of deviance"? Can it only be observed in hindsight, in the aftermath of a disaster and not before? And does it appear to defend negligent decisionmaking a bit too well? (Because the blame is now on the 'system' or 'culture')

What is the practical takeaway for "normalization of deviance"? Can it only be observed in hindsight, in the aftermath of a disaster and not before? And does it appear to defend negligent decisionmaking a bit too well? (Because the blame is now on the 'system' or 'culture')