While searching some Buddhist inspired pictures of Naraka I often found hell guards torturing others... Question is where are they on the rebirth cycle. Are they ausras? And if they are created to hurt people how can they ever find a good rebirth.
We read about young children in certain countries being kidnapped, then trained as soldiers to kill and harm others with guns and knives. Despite their young age, and been brain washed to destroy life, these young children nonetheless commit grave unwholesome kamma. Then some of these children go on to be leaders within such armies, forcibly recruiting other children.
While Buddhist doctrine attribute being born into such environments as a result of past kamma, it stresses the importance of cultivating compassion towards all, and that everyone has been born in similar situations in the past. Also, if not vigilant we could once again end up in those situations again.
To me, the hell guards in the nirayas are similar to such children. They seem to have no/little choice in the matter, than to inflict suffering upon others. Perhaps, like the occasional child soldiers that we read about, that are fortunate to escape such hells on earth, become rehabilitated and go on to help others, there could be some hell guards who do escape. In Mahayana Buddhism there are stories of Bodhisatvas who travel to hells to save those in hell, both guards and prisoners. Much like some people we see on earth.
In Buddhism a person's fate is rarely sealed. A spark of dhamma, be it a wise word, a kind deed, could be enough to set a being on the path of liberation.
So have compassion towards all, the punished and the punisher. Samsara is full of dangerous environments.
Yes, they are Asuras. They are not created. They are also hell beings who become stronger from time to time due to their past good Karma and assume a position of command. At other times, they suffer like the rest.
They are not hurting people(humans). They are hurting beings who are at the bottom of the scale of virtue. So the Karma they get is comparatively less. In any case, they don't get any opportunity to do good. So, unless a past good Karma resurfaces, they have to wait till the end of the world to escape from hells.