Berzerker
Deity
Why does this moral authority stem from existence?
You quoted the answer
you're alive (right to life) and whomever or whatever created you did so without chains (right to liberty)
What you've said here seems a lot like deriving an ought from an is. We exist therefore we ought to exist. That isn't logically valid; we would reject the argument "North Korea is a dictatorship therefore North Korea ought to be a dictatorship". There's no clear connection between what is the case and what ought to be the case. Thus, where does this moral authority come from?
You dont have the moral authority to exist because you "ought" to, you have the moral authority to exist because no one else has a morally superior claim of authority to remove you from existence. Your life belongs to you... Its one of those "self-evident truths" identified in the Declaration of Independence.