But leaders are.

Most enterprise post-mortems I've read will deliver pages and pages explaining (or justifying) poor system architectures. But they will never, ever criticize the executive or tech lead who decided on that structure to begin with.

Everyone makes mistakes, for sure. One stray outage is likely technical in nature. A simple oversight that can be corrected. But if an org's systems are constantly failing or breaking, then it falls to the leader of that org to reshape its structure.

Or they can pretend that blame doesn't exist. The system is fine. A band-aid will suffice.

Without commitment to fix systemic failures, "blamelessness" enables the abdication of leadership.