What about the karma of being a prison guard in the human world ? What will be the person's destiny in the afterlife? What are that person's habitual tendencies ?
It is impossible to sort out the complexities of a single being's karmic
history, tendencies, and later manifestations by only knowing their occupation. Occupation also will not be a large factor in their karmic
path, but what they do
with that occupation.
You are also asking the wrong person. A regular being such as myself who does not know their own mind fully, cannot know the mind of another being. This is also explained at the end of the Twenty Verses
Only a Buddha with such clear wisdom holds such an ability to clearly perceive the entirety of another being's karma
, past and future. No regular "fortune teller" can do that.
Prison guards do not experience the suffering of the inmates, being free to go as they please.
Even between two inmates, they do not suffer in exactly the same way. Each individual's karmic
situation is different.
Prison guards are still human beings nonetheless, and they suffer the retribution common to the human state. Their karmic
situation might drastically alter the quality of their human experience, like kings and peasants, but it is still human nonetheless.
They are not somehow exempt from illness, sorrow, and pain that is inevitably a part of the human experience, whether inmate, prison guard, or whatever the situation.
This is becoming repetitive, but again, as was stated, you cannot compare them to those Hell Guardians that are not real sentient beings at all, and exist completely in the imagination of the beings in a hell state. It is those beings' own imaginations tormenting them, not some other being.