i agree.
"morality" could be considered the human modality for universal law. the law has always existed and always will exist, and our concept of morality is simply our way of trying to understand universal law in a human context.
people's morals fluctuate.
in my opinion, anytime one being causes pain to another being, that to me is wrong. i use this as my baseline because experiences of pain and pleasure are pretty universal.
but everyone doesn't have to share my beliefs.
in terms of nature i dont knock any life form who, by nature, has to harm another life form to live. thats how they're programmed, that's what their instincts tell them, that's what their nature is, and they simply don't know any better. but thats the difference between animals and humans... we are capable of higher order thinking, which means we can understand higher order concepts like right and wrong.
if you're looking for a scientific explanation for the law of karma youre headed in the wrong direction. i dont think its quantifiable for the human mind at this point.