Went searching and found this fascinating and articulate article on the topic.
The biggest danger for political parties of all persuasions is a focus on power for power’s sake. NSW Labor comes to mind and perhaps explains the reactions to Rudd’s deposing.
What I like about Bahnisch’s article is his analysis of the effects of loss of purpose. It happens in political parties and it happens in corporations, as soon as an organisation forgets why it exists, it falls into decline.