[dragonwriter]

> Corruption is not a choice of the central government.

Often, it is.

> It is not like the central government can choose being corrupt or not.

Sure it is. It can also choose how much energy to devote to rooting out corruption at lower levels, but in many of the cases at issue it was the very top leaders that were deeply corrupt, so corruption was, in fact, a very direct choice of the central government.