I don't know if there is an American culture of blamelessnes. Lots of variation, such a blanket statement needs more than confirmation bias.

With that said, I think your comment describes kiss-up and corporate fiefdom culture. There are plenty of examples of that. I wonder if non-American cultures are different in that respect.

One very key distinction is freedom to admit error vs "the baby is not ugly." I don't think blameless cultures are the norm, where people volunteer to write post portems and voluntarily submit after action plans..