Earlier quoted context omitted.
The system does not handle it. If that is a problem for you, then cryptocurrencies are not for you. In a way it's like cash. If your wallet is stolen, there is no easy way to get your money back.
In reality, a crypto wallet is better compared to a bank account, though. Most people don't carry their life savings (or comparable amounts) in cash.
I would think it was the exact opposite.
A 'regular' bank account has reversibility, and so if there are some shenanigans you can (potentially) get your money back. With a cryptocurrency 'bank account' (wallet), if anything bad happens you're SOL.