Guilt is the subconscious criticizing the conscious ego when one realizes/understands the intricacies/full implications and extent of damage one may have done through ill intent or even sometimes not even with intent depending on how connected one is to subconscious and self awareness.
It’s the eternal judgement already dormant and embedded into the psyche, instead of it being a place after death it may be a place one creates here for the self, a realistic subjective hell.
This is why a child is “innocent” because they cannot fully understand the intricacies of their actions and Ill intent and so the subconscious cannot judge them because they have no grasp or conception of that topic of ill intent of conscious identity/ego. A child until a certain age is the closest thing to the embodiment of the subconscious outside of animals/nature I believe.
The brain is merely the physical receiver needed to communicate between subconscious, archetypes and personal ego/identity. If one does not have guilt internally embedded naturally, it could still be due to issues of the brain which is where psychopathy stems from, a lack of this system of internally embedded judgement of self, possibly trauma or the consuming of self by the “negative” archetypes, a lack of understanding or being able to due to psychological entrapment in ignorance and method.
People indoctrinated can easily be tricked into what to feel guilty for as well as society surely does. Through knowing self one may determine true morality and justice which is through true balance and equality.