The problem is fundamental to human organizations. People like hearing what they want to hear. And any organization without disasters for long enough will lose barriers to having sycophants who say that rise to positions of power. The necessary result is a growing disconnect with reality.
As Feynman warned, "For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." People and organizations tend to remember this after absorbing the lessons from a disaster.
But a generation or two of no disaster returns sycophants to power. Guaranteeing that the next preventable disaster will some day come.
That day may come very soon indeed.