The private sector vendor database that CAPPSII relies upon will also find its ways into the hands of the private sector for resale and private labelled data pulls. They are just being subsidized by the govt to create the best commercial database ever.
This system will be used to apprehend and prosecute major and minor criminals and also for smaller purposes like stalking and or debt collectors. Can you imagine someone being told "sorry you cannot fly, you did not pay your parking ticket in this state" and the parking ticket was issued incorrectly? It is going to happen.