Banks are thieves, it's fucking unwise to entrust our wealth with banks, never should anyone leave whole portions of their money in the bank, if for any life sudden incident, at your dismissal everything ever owned are going down the pit, not a single dime will be transferred to your family or children.
I can tell that there are big businessmen who own accounts that their family knows nothing about, one's the account gets inactive for long time, banks begin to pull out funds little by little, time without recall we have heard various news concerning such immoral behaviors, banks should not be issued live savings, we should learn how to decentralized our savings and not put all into central services like banks.
I think this is your misconception. Banks keep your deposits properly while you are in fear of thieves or robbers to protect you. Your local bank provides the highest security for your cash funds. If you wish, you can remain cashless by keeping your money in the bank and the security of your money is maintained by the state. Banks are responsible to the state for the proper storage of the money of every citizen.
The unethical behavior you have mentioned about banks is largely not correct. It is possible that a person working in a bank may be involved in such unethical behavior and it does happen in some cases. But most of them are subject to punishment. It would not be fair to blame the bank for such activities because the bank is an independent financial institution run by the state.