Because we live in the context of a culture that uses fundamentally malevolent criteria to appoint leaders we cannot reliably maintain healthy organisations.
Over the years I have been involved in and have witnessed many interventions, some of which have succeeded and some which have failed. In the case of both successes and failures, what is painfully apparent to me in hindsight is that you cannot account for them on the level of the organisation. You account for them on the level of the individual.
The locus of change and development does not sit in the structure and bureaucracy of the organisation, it sits in the intent of the individual.