The more a human being realizes his identity, the most he becomes different from an animal.
But the act of freedom that allows man to evolve is an act of freedom, so it doesn't make sense to transform it in a moral law.
The sense of law is to avoid that human beings that are "less human than others" (like Hitler or Pol Pot) damage other human beings.
But this isn't a question of morality, it is a question of security.
I also see difference between personal morality and the law - which is clearly a group thing.
But issues of law and morality often intertwine in our world so I want to take all views into account.