There is no way to deter a determined thief who has enough time. A primary reason to have such a safe is to secure the weapon from children. I don’t care what kind of safe you have, all can be defeated by a determined enough thief with enough time.
I am curious as to how you equate safe handling of firearms with fantasies about fighting off bad guys. Because there are many reasons to own firearms.
Because guns are ubiquitous in the US, I taught our son, and his friends these rules as soon as they were able to understand and remember them, e.g. 10-13 years old. This is because should they encounter guns somewhere they need to immediately know if those firearms are being handled safely. And I told them to immediately leave the area to f they ever come across people handling guns in an unsafe manner.
It will be much like how the Soviets kept the rotting corpse of Brezhnev “alive” for quite some time. Krasnov’s rotting corpse will be elevated with a stick up its ass and waved around until it falls completely apart.
There is no way to deter a determined thief who has enough time. A primary reason to have such a safe is to secure the weapon from children. I don’t care what kind of safe you have, all can be defeated by a determined enough thief with enough time.