If the variation in the moral status of what one can do is very limited, then libertarian free will adds much less to the world, resulting in a 'toy world' where one has very little responsibility for the well-being of others.
Being morally accountable for your actions—deserving praise or blame for what you do.
well-being(Welfarist framework for legal evaluation)
An individual's well-being is identified with her preferences: an individual has greater well-being in state X than in state Y if and only if she prefers state X to state Y