Law enforcement also has to tell people how they were caught, perhaps not the entire story, but at least most of it. That, too, is a good thing.

Yes, to a degree. But for instance, tax authorities don't have to reveal the algorithm they use to determine who gets audited.

Being audited isn't an explicit accusation that you've violated anything either; at best, it's an implicit suspicion to which the tax authority is fully entitled to probe and we as taxpayers are given reasonable opportunity to corroborate claims.

Absolutely. My point is simply that you can tell people what the rules are and which ones they may have broken without revealing absolutely everything about how you detect any malicious behaviour.