There's a lot of intelligent individuals especially hackers now a days. For me, I think bitcoin assures the security of their users so they come up of having paper wallet etc. So in our part maybe we should think a strongest password and make sure to always logout and dont share personal info:) to prevent this kind of event.
Bitcoin itself have never been hacked, maybe that's the reason why the price of it reaches $8637 while I am typing this. Hackers can do hack Bitcoin exchanges just like what happen to Mt.Gox because it is centralized, they can also get Bitcoin wallets by spreading different kinds of malware in the Internet and those gullible Bitcoin users will leak their own personal information without noticing so everything is hack-able for hackers if we don't take safety measures in securing our very own Bitcoins.