Lots of people have believed that they were friends with the police and were actually being manipulated into metaphorically hanging themselves- some of them innocent.
The point that being friends with police will be beneficial to you - Means there's a scenario where the inverse is also true. Not being friends with police is used to your detriment.
Police Officers exist in a career field that is riddled with incidents of Tunnel Vision. The sibling comment posts a video about not talking to police from a law professor. I'd heed that advice.