In my opinion this thread is full of unconscious assumptions that have no actual reality resulting in a belief that produces silliness. People seem to think that Karma is some kind of pay back for having committed evil actions when in fact it's just the consequence of programmed sleep. People do not want to know what they feel which is self contempt and everything they do is designed to keep it that way. This all happens unconsciously, hence in our sleep, as a program. it isn't volitional or under conscious control. There is no moral agency and so there is also nobody who can be blamed We live in a world full of sleeping programmed machines, one program blaming another doing violence and acting out triggering other sleeping machines. Karma is the consequences you face by being asleep like a wheel will roll down hill. The dream is that you are awake and functioning on the truth of core beliefs. Because we feel worthless we unconsciously pretend to be someone. What merit can a program have, What virtue does clock have by going tick tock.
Whatever you imagine or what empty threats you cast or how deeply you deny things, Karma will have its effect. Negative Karma costs the joy of being. Best to consider if it's possible to wake up.
We become what we fear and it will happen whether you think you want it to or not. It's the way things are.
It's absurd to wish bad Karma on people whose karmic fate is sealed by the fact that they are as they are because they are actually suffering from inner misery.