I could be completely wrong here, but doesn't your "right" to remain silent only come into effect when you are charged with a crime? Otherwise, do you not have an obligation to cooperate with LE and provide whatever information you may have? I guess you can always invoke your 5th amendment right to not incriminate yourself, but that implies you are guilty of something.
There are something like 10,000 federal crimes. There are even more state crimes, if you add up all fifty states. And then there is the IRS, which has developed into its own legal system (and a very scary one).
I have no way to know if I am in full compliance of the law at this moment or not. I think I am. I try to live a law abiding life. But I do not know for a fact that I am.
For instance, a couple months ago, I bought a dried flower arrangement at a craft fair. It came in a basket with beads and shells and feathers decorating it.
Do I know the names of every single bit of plant matter in that arrangement? No. Therefore, I don't know if it is fully legal in my state or not.
Do I know the provenance of the shells and feathers that decorate it? No. Therefore, I don't know if it is fully legal in my state or not.
Do I know whether the person I bought this arrangement from illegally acquired or stole any element of the arrangement? No. I spent maybe ten minutes with her total and that included other people asking her about her display. Therefore, I do not know whether I received illegal or stolen goods. I didn't even make much of an attempt to ascertain that I did not; I could have asked for receipts showing provenance of all the elements but I didn't.
That arrangement could be in violation of a number of laws and regulations and I do not know it. Add to that the fact that ignorance is not a valid defence.
So, say I were friends with someone that I believed was being unjustly accused of a terrible crime. And even though I know that I am innocent of anything at all to do with that crime, the police are now knocking on my door and they want to question me.
Are they offering me legal immunity for anything they might see in my home that is illegal but not directly related to the search for Kyron? If not, so sorry, go get a search warrant.
Are they offering me immunity for anything I might say during questioning not directly related to the search for Kyron? If not, so sorry, I won't answer a single question without legal representation. And I highly doubt a lawyer would advise me to answer any questions!
There was a case in Seattle last winter where an innocent bystander was accused of some piffling offence for asserting his right not to identify himself without probable cause. The police officer proceeded to threaten him and then lied about it in order to charge him.
Too bad the victim turned out to be a computer expert who was able to figure out the city's complicated surveillance databank and prove that the officer was lying. The videotape exonerated the victim.
And now, literally thousands of cases from that jurisdiction are being re-examined because when the system is caught red handed once, it tends to make everyone suspicious.
I lack a certain amount of faith in LE and it is founded on very real cases of malfeasance, some high profile, some not.