Boeing has gotten Too Big To Fail, way too much military/space contracts. The US government can't let them fail because then the only remaining space capability would be SpaceX who can't fulfil everything (and is under control of an increasingly erratic billionaire).

What should happen is that the government should do it just like with the banks in the late '00s: assume control over Boeing+Spirit Aerosystems if not outright nationalize it (without compensation to shareholders, to incentivize other shareholders of other companies to make sure their leadership doesn't prioritize profits over safety), enact sweeping changes, and then after a few years either sell the remains off again or keep it under government control.