Earlier quoted context omitted.
The public currently wouldn't buy the stock due to bankruptcy risk. If the government commits to buying what's left at the same terms the public would start buying as well reducing the burden on taxpayers. Historically this kind of deal has been profitable for governments in the cases that I know of (in banking), while at the same time keeping more jobs and thus reducing economic impact of unemployment.
If the public wouldn't buy airlines stock because of "bankruptcy risk" then why was Carnival Cruise Lines able to raise more than $6bn in debt and equity recently?
https://www.businessinsider.com/saudi-arabias-sovereign-weal...