Part of the rules are that the regulators are supposed to shut down a bank before the run happens. They're not supposed to let the run happen and let the poor saps that were too slow moving their money bear the brunt of the losses.
Yes, and had SVB (among others) not successfully lobbied Congress in 2018 to get big regional banks excluded from more stringent "stress test" requirements, perhaps the regulators could've detected faults in SVB's capital before it was too late.
Part of the rules are that the regulators are supposed to shut down a bank before the run happens. They're not supposed to let the run happen and let the poor saps that were too slow moving their money bear the brunt of the losses.