http://blogs.lse.ac.uk/businessreview/2017/08/29/why-feeling-safe-at-work-increases-innovation/
This article explores the importance of having workplaces where personnel feel safe in speaking up about issues, knowing they will be taken seriously. It includes examples of where the culture discouraged personnel form speaking up and the consequences of that. I would add Challenger Space shuttle, Texas City and Macondo as additional examples.