Nothing is good or bad unless you think so. If you think something is wrong after doing it yes it is wrong and the Karma will return to you but if you think what you have done was right even if according to you Karma will not return to you. Because what we think we release the wave into the universe and the universe looks for the source of energy of that particular think wave and then you get power if you stick with the sing same thought over a long period time. So the inter universe moves with the wave and energy only. This is my a criminal become successful in doing crime. The universe is made of two things wave and energy rest are just destructive. Thinking is the greatest source of connecting with universe. You think keep thinking and you start releasing wave into the universe and the universe helps you to find the source of same energy source and the same returns to you with extra power. So if you are sad you releasing this wave into the universe and the universe returns you with