The government stood to gain authority by implementing the social contract theory. This was the theory that originated during the Age of Enlightenment. This authority helps to protect the remaining rights of the citizens.
It's possible but extremely unlikely to Revive an extinct animal but It is possible to create an organism similar to whatever extinct animal that is in question using its dna or the dna of its relatives. If scientists did revive extinct populations it could have an extremely detrimental effect on humans and our environment.
