As long as your private keys are safe your bitcoin is safe. Because it is merely impossible to breach into another's wallet without knowing private keys. So keep your private keys safe. Best use offline wallet to ensure security.
Bitcoin is safe as long as you keep your private key and addres key by not tellling everyone.I think ourself is responsible of the safety to our bitcoin..And I think bitcoin today is having some step of ways technology to avoid some criminal or getting hacked by the hackers.