The point is that bitcoin holders don't need MtGox to hold their money. They would've been safer by far storing it in a 2-of-3 wallet, with one key held by a third party which does passphrase authentication (or similar) before they'll sign a transaction, one held on your computer, and a third stored somewhere hidden as a backup in case one of the other keys cannot be accessed.

Two of these already exist: BitGo[0] and GreenAddress[1]. Try doing that with physical money, and you understand why we have banks. With Bitcoin, you can have any level of security you like, and somebody only has to implement it once.

[0] https://www.bitgo.com/ [1] https://greenaddress.it/en/