As an ex-cop, im not crazy about them and don’t associate with them. I was deputized as a us marshal. Major illegal shit happened. They get the bad guys, but not legally..
I think the point of the article is that it is prudent to keep in mind the inherent conflict between your personal interests and the interests of the institution as interpreted by the officers of the police.
It is always and in all situations your duty as an American to consider your own self interest first. This is one of the core things that make America Unique.
In some circumstances it may be in your self interest to cooperate completely with the police.
In other circumstances it may be in your self interest not to cooperate.
And if it is unclear where your self interest lies it is your basic civil right to hire and advocate ( or demand one at public expense).
Maintaining civil order is a core reason we form governments. But to keep a health balance it is necessary for citizens to actively stand up for their interests against them.