Earlier quoted context omitted.
I think you are conflating accountability and blame when I don't think those terms can be used interchangeably here. Accountability can be used as a way of assigning blame, but that isn't all that it is good for. Accountability, at least as presented here, is about feeeback between those affected by a decision and those making it. In a "blameless culture", people are still held to account for their decisions and acti…
A blameless postmortem culture says that when a human error is identified in the causal chain leading to an incident, there will be no consequences for the individual. In a sense it embraces blame but eschews accountability.
The two concepts we are talking about are each talked about under each label so there is enough ambiguity in both words that this is true. However choosing to use 'blame' in the opposite sense from the one being used in that context adds nothing to the conversation.