1) The authority to imprison you on a whim and suffer no repercussions for exercising that authority in ways that judges and other police officers agree is excessive.
2) The authority to lie about what you said or didn't say and suffer no repercussions.
There's a large cost associated with the "never talk to police" strategy, and it only starts to probabilistically pay off after you've gotten to the point of requiring complex court proceedings (which you might never have gotten to if you were more cooperative in the first place).