I've seen people shy away from the idea of the blame-free retro out of a fear that it will lead to a cultural dilution of responsibility and accountability, and I think that's a very reasonable concern; cultures of accountability matter. But "blame free" is not "fault free", and no system that relies on flawless human execution _will ever_ be reliable. Accountability has to be found in the commitment to the ownership of failure and responsibility for systemic improvement, not in "zero errors".