I think i never heard any news regarding an account being hacked, so the security of bitcoin wallet is still solid, the one that being hacked usually it's from phising site and suspicious link
And hopefully it will never being able to be hacked so we don't have to worry about our account
Must you be living inside the cave for centuries didn't you? as for example, the recent hack has happened to bitfinex and loses about millions of dollar, and it's just one of many which is fortunately leaked in the media.
Just imagine if some bitcoin users don't really care about the security of their wallet and ended up targeted by hackers and finally getting hacked, there might be so many people out there who have been hacked but didn't publish it into media.