Given the probably reluctance of most victims to come forward, active concealment by (apparently) multiple large banks (Deutsche Bank was sued and settled with New York, and now JP Morgan by USVI), investigators getting proof beyond a reasonable doubt even if there aren’t powerful people with law enforcement connections with an interest in derailing investigations and accountability (there’s at least some reason to suspect something like that was involve in his wrist-slap the first time he was arrested, if not also beyond that, and certainly his rumored clients suggest that if there was, it might have been more about protecting them – and thus extend beyond his death – than about protecting him.)