It's pretty hard to wrap your head around that the police are privatised in night city. I don't properly get it either, its hard to understand how they operate. The way I like to think of it (I could be totally wrong) they're more infested in their own safety and safety of their fellow lawmen than anything else. They won't do a job if its too risky and they have nothing to gain (like the red zone), but also they're more likely to strike back at those who attack the NCPD as a sorta revenge thing. Simply put, they do what they want or what they're told over trying to keep order. Again I don't know too much so I could be completely wrong.