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.
The title of this thread is a bit misleading - it seems like Bitcoin can be hacked (and by Bitcoin, we mean bitcoin network, the blockchain).
But the truth is that you mean individual people's wallets and coins stored by individual bitcoin users.
Without maintaining proper digital hygiene we can be a target for all kinds of malware, trojans and direct attacks - not only your bitcoin wallets can in danger, your bank accounts, PayPal etc. too!