> MHO they should have let the biggest banks crash and relied on the FDIC to protect Joe Schmoe's bank accounts.
The problem have never been bank accounts. The problem have been pension accounts, all the time.
Instead of the old European way of a public, universally funded rolling pension scheme (aka current workers pay for the pensions of the current pensioners in exchange for credits), the US went for almost pure stock and other IOU-based (e.g. bonds) pension funds - a decision that has been biting the US in the butt for the last fifteen years. The FED literally can't do anything that even has the potential of sending the stock market into a major decline because even small corrections wipe out the pension security of the people.
Of course, Big Finance has been exploiting that forced abundance of money ever since. When 35 trillion dollars (!) [1] are available in the market solely due to pension funds, even extremely tiny management fees of a tenth of a percent add to a massive payout for the industry!
The US is in for a really, really wild ride: The pension system obviously needs reform when large amounts of "pensioners" have to work at age 75 and above because their pensions are too low [2], the pension system is unsustainable because it effectively requires endless printing of money and introduces extremely bad side effects (such as enormous amounts of capital being wasted on bullshit in the vain hope it might evolve into a "unicorn"), and at the same time the political deciders can be very well said to be bought off by Big Finance which will do everything it can to avoid being cut off of the money heroin spigot that is pension funds. Not to mention that voters are not going to vote for any politician that the opposition (aka either primary competitors or the actual opposition) can smear as "it will endanger pensions".
The effective way out would be a nationalization of all pension fund assets and a complete turnover of the entire system, but we all know that that is not going to happen.
[1] https://www.statista.com/statistics/421729/pension-funds-ass...
[2] https://www.theguardian.com/money/2021/dec/13/americans-reti...