Just a little nitpick here, but your last statement is unlikely. There are actual computer systems that are completely unhackable even by any team of skilled security researchers (non-networked devices, etc).
Only if you limit ‘hacking’ to networking and don’t include things like social engineering, blackmailing and physical attack/intrusion.
Only if you limit ‘hacking’ to networking and don’t include things like social engineering, blackmailing and physical attack/intrusion.