I appreciate the complexity of the unwind, and that many employees may not have had a direct hand in the risk that SVB accrued, but I think there's a bigger picture at play.
Banks are supposed to be one of the bedrocks upon which the economy rests and they are given certain privileges (like access to low interest rates ordinary people cannot get) as part of that role. Its clear the financial sector needs to have an extremely close eye on it to not cause all sorts of destruction across the economy, which it still manages to do pretty regularly out of a fun mix of short-termism, stupidity, and greed.
So from a signaling perspective, if the org is sitting on a lot of risk and employees may have benefitted during the accrual of that risk, shouldn't they also face consequences? Wouldn't that cause each employee in a bank to pay some more attention to the fundamentals of the org, to put pressure on any situation where large risk accrual happens? Wouldn't that cause the internal structure of banks to change so that more eyes were on these large risk accrual moments, because talented people wouldn't join unless they knew their livelihoods weren't at risk by one bad decision? Regulations can't be the only form of pressure for banks to not fuck up.