Even when banking security is working at 100% they are still not safe.

My grandparents experienced a bank holiday, where every bank shuts down and then a few reopened only to explain that every dollar is now only worth $0.75

When Obama took office his first decision was whether or not to impose another bank holiday to devaluate the currency, he decided to use Quantitative Easing instead, but the option is still on the table if the US is ever in desperate need of money.