People put their money in the bank to safeguard themselves from getting robbed. Yes, sometimes the banks end up being the thieves. But if people simply stashed

People put their money in the bank to safeguard themselves from getting robbed. Yes, sometimes the banks end up being the thieves. But if people simply stashed their money under the mattress, that would be like going back to square one. Thugs would have a very easy time, taking your money, if all they have to do is convince you to reveal the key.