If the bank sees you carrying in a body to put in the vault, I would expect them to call the authorities. However, if the bank guarantees privacy of what they store in the bank, I don't expect them to be looking inside anybody's safe deposit box to see what is inside. It doesn't matter if it is money, personal documents, blackmail material, jewelry (stolen or purchased) or even body parts.
Investigating the contents of each safety deposit box, or even having the ability to do so is outside the scope of what a bank vault services are sold to do.
A bank vault, like encryption, sells protection. It is for all intents and purposes neutral. It can be used for good and can be used for bad. 95% of the time a bank vault or encryption is either being used for an ethically neutral or at worst ethically ambiguous use.
When any technology or product is used for bad it is a social failure. Crime will always exist. The quantity of crime committed can be mitigated by sound long-term policies that treat those causes that are statistically most likely to contribute to crime occurring in the first place.
The problem is, you're missing the point. What they would do if they came across illegal content is irrelevant. They shouldn't be looking at the content in the first place, so this is a non-issue.
In a new theoretical world where browsers can encrypt and decrypt data securely without the server having any idea of content, and where you can solve all the issues around allowing other people you want to be able to access that data, then sure it's a non-issue. I was talking about reality ;)
Ever. I don't have the original source in front of me, but with enough bits, assuming there isn't some fundamental flaw in the encryption algorithm, you couldn't brute force a key before the heat death of the universe even if you recruited every particle in the visible universe for your computation.
I think you're being downvoted because you're making a very similar argument to "if you have nothing to hide you have nothing to fear". The only circumstance where the bank would find a dead body in a vault is one where they open every vault just in case.
Surely there's some line somewhere...
edit: apparently HN thinks there is no line anywhere.