Bitcoin is not much safe when you buy in case of scam, like seller do not deliver service then you can do nothing. But in case of privacy its save, no verification, no identity, nothing.
This means that this is not BTC's fault. It is your own carelessness that leads you to that point. Like real wallet it can be stolen if not keep in a safe place or if you choose to trust a wrong person.
Some people invest some if not all of thier asset in bitcoin. They are lured by its growing up value its equivalent to fiat currency but is bitcoin really safe and secure.? What do you think.,
As far as i know, bitcoin is secure but it is not safe hackers.
If a hacker wants to hack your account or wallet, that hacker will do everything that he can to hack your account or wallet. But to prevent that to happen, make multiple accounts and wallets. Also, just keep your accounts private even to your family and friends.
SHA-256 is very strong mate, if you are careful enough or when you know how to avoid phishing and know how to safeguard your computer, if the hacker don't know your address or keys, he will just die trying to hack your coins. Even if he has done everything he could.