Cripes, is it the banks fault at all? What about the scammer? Why aren't people railing against the police for not going after them and government for not legislating against it or making agreements with other nations to nail these opportunists?
I am not a favourite of the banks, but I am not convinced they are at fault here. Especially since the media are involved, assuming they have provided all the facts is a big leap of faith.
What if it is a joint account? Both parties would have to agree, this is a big problem with marriage bust ups. Was the contract he signed clear and unambiguous and he simply didn't read it? If so, it would be illegal for the bank not to honour it. As far as the bank is concerned, they are legally obliged to provide the money as the form is signed by the client, they break the law until the client legally advises them otherwise.
If people are p**sed off with banks now, imagine if they did things illegally as well as (some say) immorally. Don't forget that the rules the banks operate under are largely due to prior legal actions brought by customers or are legislated by government.