Maybe I am missing the point here, I confess to only skim reading the last few posts. Tell me how on earth ANY rule changes would have made any difference to that ABC crash, or any other.
The pilot of the ABC machine was not instrument rated and never had been from a Civil perspective. Unless I am mistaken he also wasn't current by the company's SOP's. Mandating an IFR rating for dark nights or similar, perhaps two pilots minimum would have enhanced the safety of the flight and the outcome.