What we care about as a society is that an airline industry exists. The reason for government intervention is to prevent economic contagion (the spread of one failure to another). That was the argument for bailing out banks during the financial crisis, and it doesn’t exist in the same dimension with airlines. Nonetheless the industry is an important one once we’re ready to recover.
However the planes will still exist. The airports and gates will still exist. Skilled pilots and mechanics will still need work. The only reason to intervene will come later, if at all. Once airlines are in bankruptcy the relevant question is if they keep flying. And that’s dependent on available new capital during the bankruptcy process. Shareholders should take their haircut first.