>I think that internal investigations are acting as a substitute for actual criminal investigations.
And how does this work? Are prosecutors really like "oh ok, we won't do any investigating of our own then"? If so, who's more to blame, the companies doing the internal investigations, or the prosecutors for falling for it? If the police show up to a residence to investigate a domestic violence report, and then one of spouses answers the door and says everything's fine, should we blame the spouse more or the police for not following up?
I think it is much simpler than what you’re describing.
Executive at BigCo does something bad. Normally people would report this to police and/or regulatory agency. Instead the company investigates itself to pretend they’re doing their due diligence so that there is a paper record, but with no intention of actually surfacing anything to the police.