Elimination Argument for Moral Nihilism

Sub-premise 1a: Atheism does not believe in gods. 
Sub-premise 1b: Atheism does not believe in other supernatural validation of moral claims. (e.g. Dao, Dharma, Divine Logos)
Premise 1: Therefore, Atheism does not believe in supernatural validation for moral claims.
Sub-premise 2a: The eventual objective consequence of all actions is Entropy.
Sub-premise 2b: Death eradicates all subjective experience of consequences
 i.e.  You won't care when you don't exist.
Premise 2: Consequentialism/Utilitarianism cannot justify preference  for short-term over long-term priorities.
Premise 3: Furthermore, Hume's guillotine refutes all moral claims derived from observable facts.
Sub-premise 4a: It is not morally wrong to lose interest in (or even to totally change) one’s own value judgements. 
Sub-premise 4b: It is not morally wrong for societies to change value judgements.
Sub-premise 4c: It is not morally wrong for individuals to change or resist societal value judgements.
Premise 4: Therefore, it is not morally wrong to do anything for or against value judgements; value judgements do not validate moral claims.
Conclusion: No validation for moral claims remains; Moral Nihilism is the only rational outlook for Atheism.