[V-2]

Quite the opposite. Anchoring the law in morality works like a safeguard against the dystopian scenarios. Laws can be changed overnight - but permanently altering societal views on morality takes considerably longer.

This process is still achievable (called 'perekovka' by the Soviets), but it can take whole generations, and a great deal of power.

Besides, when the law isn't anchored in commonly shared sense of morality, you'll basically have no other option but a politically oppressive system (to balance this factor out).