I don't see a connection between "career politicians" and non-"productive societies". Corrupt societies can be corrupted by career politicians or a revolving door of temporary politicians.
I never said that there is a link between career politicians and unproductive societies. I said that whenever there is a productive society, there will be career politicians leeching on it.
When you can't be productive yourself, you leech off the biggest thing you can, in the hope you can go un-noticed until the parasitism has been forgotten and you can convince people you are a symbiotic life form :)