First of all if you own a bank account in a good bank then you should know that its very hard to hack one's bank account, it's almost impossible unless done due to personal flaws, like sharing your key or bank account details or something , you know the system behind Bitcoins and the system behind banking system is same .
Something by the name of cryptography whose Advance form is block chain . It's a complex code involving complex mathematics and the transactions are only completed through very complex and complicated steps impossible to penetrate.
For Bitcoins the same thing operates but with no intervening part or whatsoever , it's p2p direct transactions and this is even more secure and private.
The reason why you hear news like :- someone got their Bitcoins stolen or something is because they have personal flaws , they shared the private keys or the password with someone else..or they used a bad wallet.
It's on you how safe you make it .
There won't be any reason for bitcoin security because bitcoin and cryptocurrency is secure in the first place.
Cryptocurrency is the encrypted currency, which is nearly impossible to hack your key.
The holders of the coin is the one who should secure themself. Like learn how to protect their wallet.