Quite sure you answered your own question here. Survivorship bias isn't a valid argument. Lebanon, Greece, Pakistan, Turkey all come to mind in the last decade, all with unsustainable amounts of debt.
The modern monetary system is a faith based system which hands leeway to governments to create and destroy supply at will. When people lose faith it all collapses very quickly, the failure modes are never slow. The relatively small Silicon Valley Bank is a great example of this and the systemic collapse in confidence of banking.