Letting large businesses (airlines etc.) go bankrupt isn't just a disaster for the rich -- it's a disaster for retirees who hold a majority of savings in equities (index funds etc.), as they've been told is the responsible thing to do.
Don't throw the baby out with the bathwater -- or grandma out with the billionaires.
We want to reduce inequality? Great. But do it in a targeted way, through taxation that takes into account people's income and overall wealth. Not in a blunt-instrument way that harms middle-class savers along with hedge funds.
And not through letting a host of major corporations go bankrupt through zero fault of their management/board.
(Remember, it's not like an airline can buy insurance against a months-long pandemic, nor are public companies supposed to retain unnecessary cash in times of profit -- the IRS virtually requires them to distribute it to shareholders either through dividends or buybacks.)
EDIT (in response to comments): OK, I exaggerated a little -- retirees shouldn't be holding a majority of savings in stock. But since one common rule of thumb is to hold a percentage in equities that is 100 minus your age, a 70-year-old still has 30% in equities. And your 50-year-old saving up for retirement has half. The main point still stands: normal middle-class folks hold equities as a significant part of their savings. It's not just billionaires who own equities.