I have worked years in a culture that attributes all mistakes to defects in the process. And the only possible individual mistake is not to follow the process. Process culture is just as bad as blame culture in some ways. It leads to ever more complex processes. The teams I've seen do best, the manager of the project will allow process to be informal and treated as best practices only. Then people are held accountable for bad results by putting them on tasks that can cause less damage. Good results mean more critical tasks. No single mistake kills a performance review or promotion, or makes one. We all make mistakes and get lucky. But over time reapeated mistakes or successes do have an impact.