Always follow the money.
Boeing is being sued and the amount of money that will be involved "Should they lose" with stock losses will bankrupt them. It behooves them to step up and break the law, and why not congress will protect them no matter what they do. They have proved that point already. If a single human life on the street is worth but a single drug hit, the cost to stop a insider from telling the truth vs their potential damage is but chump change to them.
Most likely by now, the actual killer is already dead and will never be found, so nothing traceable back to them. Happy flying.