In meditation, all things yoga and all things dharma may come to light. Truth is revealed in the meditative state. This includes a deeper understanding of karma and how and why it works.
Paramahansa Yogananda and many other yogis have refered to the gain of knowledge through meditation as a bona fide science. Sure it is more of an individual revelation as opposed to the universal and demonstrable recognition of other scientific principles like, say gravity. But nonetheless, yoga/meditation is a science.
Since becoming a Hindu I have been more than just a little bit uncomfortable with the expression “Karma’s a bitch.” Not because of the profanity. But to witness another’s downfall/misfortune and to point out that person’s deserving of said downfall with the expression “Karma’s a bitch” is more than a bit judgmental, I think.
If it is at least scientifically demonstrable (to the individual) in yoga that “what goes around comes around”, then the expression is still judgmental because we all appear misguided at times. But at least there is some science behind it. Whether it is “a bitch” remains debatable.