“They” in your sentence is not SVB. Depositors who put money in an accredited bank should not have to worry about bank runs. Risk free banking for depositors is a cornerstone of the US economy.
There’s also no moral hazard here - the shareholders, equity partners, and debt holders were correctly wiped out.
Risk free banking past FDIC limits is not explicitly a cornerstone of the US economy, it is a thing that is sometimes done and sometimes not done depending on contagion risk. If it's so essential then we should make it explicit so that everyone pays the fair share for their deposit insurance.
There’s also no moral hazard here - the shareholders, equity partners, and debt holders were correctly wiped out.