Slave Morality and Socialism

Nietzsche is often interpreted as arguing against Marxism on the basis of 'Master Morality': 1. There are those who are naturally strong, and those who are naturally weak; 2. Might is Right; 3. Therefore, the strong have a right to enslave the weak; 4. Therefore, there are Moral grounds for rejecting Marxism.  Now, while that interpretation has textual support, his stronger argument against Marxism is on the basis of 'Slave Morality': 1. Slave Morality expresses the Values of Slaves; 2. According to Slave Morality, Values are objective; 3. The positing of the existence of objective Values is an expression of a desire to submit; 4. Marxism posits the existence of an objective History the goal of which is Socialism; 5. According to Marxism, Socialism is 'good'; 6. Thus, Marxism is an expression of a desire to submit. 7. Thus, Marxism is self-contradictory, because its presumed liberation of Slaves only perpetuates Slave Morality.