I don’t think a fine is an appropriate result. Any amount of money paid to the government is not going to get those people back, it’s not going to fix Boeing’s workplace culture, it’s just going to drive them to cut more corners to recoup the cost of the fine.
Clearly, they can’t be trusted to run their own QC operation in an industry where a few missed bolts leads to the violent deaths of hundreds of people. The “punishment” should be the creation of a QC and safety team that is accountable to the American people, which is paid for directly by Boeing. This team is financially liable for Boeing’s mistakes, and picks a fee based on how well boeing is passing QCs and inspections. Most importantly, Boeing’s C-suite is not allowed to privately communicate with this team.