Karma: cosmic principle according to which a person is rewarded or punished in one incarnation according to that person's deeds in the previous incarnation.
There is no cosmic righting of the scales of justice. People do however reap what they sow. If you are an ass, you will be treated as such, you will be known as such, and you will have the life of such. It's not magic, its natural. There is no divine intervention, only individual's making choices regarding your acts (as an ass) and choosing in their self interest to treat you as such.