Attitude of banks
True story:-
Lady asked to go into bank to draw out some money for her father.
No problem says the cashier - let me update your passbook while you're here.
Passbook updated. Hang on - unknown transaction - withdrawal from an ATM.
Cue big argument - cashier insists the system cannot be wrong. Lady insists her father cannot have withdrawn the money as the ATM was 100 miles away and he is too ill to travel. Cashier insists the system cannot be wrong. Argument escalates to senior supervisor who insists system cannot be wrong, no one can keep track of another person 100%, ill or not.
Lady says she can prove it was not withdrawn by her father - he hasn't got an ATM card.
Money duly restored to account.
Moral of the story - the system cannot be wrong. Except it can and you have to prove it.