Take a look at what happened with SVB failed and needed to raise the cash to meet their deposits. It massively depressed the value of a lot of the investments they held in the markets. As other banks fail, similar kinds of movements can happen and potentially have other downstream effects causing a lot of instability and chaos into markets. Maybe the big banks will be able to capitalize on those, maybe they'll end up hurt as well. Keeping the market healthy can be a good thing.