The simple and incontrovertible fact is that the US banking system is as close to 100% safe as you can get. Bitcoin isn't anywhere close.
[1]: http://www.fdic.gov/deposit/index.html [2]: http://www.fdic.gov/bank/individual/failed/index.html
[1] http://www.fdic.gov/consumers/consumer/information/fdiciorn....
In many countries currency deposits (up to a certain level) are protected by law and government guarantees.
"From a legal and financial accounting standpoint, the term "deposit" is used by the banking industry in financial statements to describe the liability owed by the bank to its depositor, and not the funds that the bank holds as a result of the deposit, which are shown as assets of the bank." - http://en.wikipedia.org/wiki/Deposit_account
"Bank deposits are simply a record of how much the bank itself owes its customers. So they are a liability of the bank, not an asset that could be lent out." - p.http://www.bankofengland.co.uk/publications/Documents/quarte...