People keep repeating this without context. The auto companies are strategically significant. That didn't prevent them from going bankrupt [1][2]. Wiping shareholders doesn't mean blowing up the factories.
I'm increasingly convinced Boeing needs to go bankrupt. It can then shed unprofitable units--through spin-offs, sales or liquidations--and restructure its obligations. I'm not convinced the union comes out of that better off than it is now. But America sure does.
[1] https://en.wikipedia.org/wiki/Chrysler_Chapter_11_reorganiza...
[2] https://en.wikipedia.org/wiki/General_Motors_Chapter_11_reor...