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I see no downside with providing that information. Only lots of downsides of not providing it.In your scenario, there are definitely downsides to providing this information by talking to cops: you can get implicated and even convicted of the crime, and the actual criminal be left alone. At any time during your conversation with the cops, they may decide you know too much (or know details only the kidnapper would know), or find some turn of phrase suspicious, and turn you into the primary suspect. Remember Duane's claim that many cops believe "9 out of 10 times, the caller is the one who committed the crime". This applies here, too.
The downside is pretty big: not only could you be in legal trouble -- even convicted -- but the actual criminal could get away. This is not hypothetical, since Duane mentions cases where this happened! (E.g. the man wrongfully convicted of killing his wife; or the man wrongfully convicted of killing a local shopkeeper after volunteering to help the police find the killer, out of a sense of civic duty).
If at all possible in your country, I would advise you to report this information to a missing children hotline unaffiliated with the police, instead of speaking to the cops without a lawyer.
> But like I said, if the assumption is (like Duane apparently has), that cops are always bad, corrupt and the enemy, well, then this is the problem to deal with.
This is not at all what Duane claims. Respectfully, I must ask you to refresh your memory of the video. I also recommend the follow up video which I linked to, where he explains his motivation (i.e. decreasing the appalling number of wrongful convictions in the US).
> He didn't ended up in jail, right? He was just wrongfully accused and interrogated in a very wrong way adding to his misery. That chance wouldn't stop me from cooperating with the police, if there is a chance to save someone.
We don't know whether he ended in jail or not, Duane doesn't say. We only know he got in real trouble, and this after the cops knew his daughter was dead, so at that point there was no possible way to "save" anyone. He does mention at least two cases where an innocent ended up in jail, one of them for 20+ years, while the assassin of his wife got away. His mistake? He spoke to the police, volunteering information, and without a lawyer present.
It's of course your choice to risk it and speak to the police without a lawyer. In the US, it's a risky, unwise choice -- one cops wouldn't take themselves, for example -- but it's your choice. A choice your attorney would strongly urge you not to take, but that you're entitled to take anyway.