Law and morality have the same root, the human hierarchy of psychological needs. Laws exist to maximize the number of people capable of meeting the lower tier needs with the most benefit to society, at least according to the views of those who wrote them. The law is nothing more than one set of morals enforced upon others by those in power. At least big laws, the major social taboos. Theft, murder, etc are all illegal because basic human psychology makes us all intrinsically value life, resources to sustain our lives and make them easier, and freedom to live our lives.
That said, morality is still worthless. Moral claims are normative, and as such can only be supported by at least one other normative premise, infinite regression in argument, no ethical claim can ever be rooted purely in fact. Morals are nothing more than a psychological construct we use to enforce our values determined by our base psychology on society. All animals have similar instincts, we with our 'superior intellect' have just opted to take it to its upmost idiotic extreme.
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