Recently Bloomberg posted the information that it took hackers less than 10 years to steal over 14% of all existing Bitcoins and Ethereum from the wallets of their holders. The total sum they have stolen is more than $1,2 billion! How to protect yourself from hackers attacks? Are you afraid of this stuff?
I am more afraid of losing my private keys (losing paper wallets, forgetting encryption key etc) than hackers. Hackers generally target big exchanges, malwares etc etc. If you are careful about a few things, your chances of getting hacked is very low.