A systemic bank collapsing means that the companies who use them for paying their employees and suppliers, well, don't. This causes a chain reaction as the comp

A systemic bank collapsing means that the companies who use them for paying their employees and suppliers, well, don't. This causes a chain reaction as the companies with a solid business model aren't able to execute it because they can't pay for their inputs (or their B2B customer can't pay for their deliveries) as their liquid cash is frozen until insolvency may return part of it, and they have to suspend operations, which is yet another hit on people (not) receiving salaries and on all the other related companies. Protection of systemic banks is not about investors and loans, it's about the liquidity/working capital of companies and the people's salaries.