I found the Boeing manager!
Perhaps you and I view the world in a different light, but in any organization where there is even some semblance of hierarchy, the manager is, at the end of the day, always responsible.
If management isn’t aware of what’s going on on the factory floor, then that’s definitely a failure of management. If they didn’t receive any signals, management should’ve investigated. If they hired 100% incompetent people they should’ve hired better people.