Assume long serving politicians are rationally maximizing their careers

Imagine you had no idea how to ride a bull, and you encountered a bull rider. The rider is swinging his free arm and body wildly, at apparent random. Surely hugging the bulls back and moving less is better. You would immediately think the man is crazy, perhaps he’s having a seizure.

Now imagine your friend says “he’s been on that bull for five minutes, a town record”. Know you should reconsider. Surely someone has tried your strategy and lasted less. Flailing must help him stay on the bulls back, strange as it seems.

Politicians are the same way. Every political system has a steady stream of talented challengers, who incumbents must defeat. The Nancy Pelosis, Boris Johnson’s and Ayatollah Khameinis of the world may look like their flailing, but usually the know exactly what they’re doing.