I'm a big fan of currency, that has no central banks and cannot be really controlled by the governments. However it shoud be fair to say, that we need to kink out the problems and keep the ingeniuity of hackers in check, because after the demise of Mt. Gox Bitcoin exchange another one bite the dust:
Flexcoin, a Bitcoin-based bank shuts down after $620k in coins stolen
"…on Sunday, March 2nd hackers breached the company's security and managed to steal 896 Bitcoins, valued at more than $620,000 USD."
Looks like that the fact, that the Bitcoin is anonymous, lead to being very attactive for hackers to stole. However at least "only the hot wallet was breached, leaving thousands of bitcoins in cold storage untouched and safe" ... So the cold storage (servers off the net) was a good idea, after all