Sometimes people die and there is no one to blame. The tendency to find a scapegoat is strong and human and needs to be resisted.

Maybe someone should go to jail here, but I doubt it.

The legal definition of culpable negligence is actually pretty straightforward.

I see no reason not to hold key decision-makers responsible for the consequences of decisions that aren't just misguided or incorrect, but actively and wilfully negligent of factual information - especially if they cause even more deaths by attempting to suppress that information and place blame on innocent parties.