I did not say the Golden Rule failed to abolish slavery, but you know that.   I said the Golden Rule proves slavery was unjust.  The pursuit of justice is  a noble political endeavor.  It was the injustice of slavery, not the doctrine of equality, that motivated abolitionists and caused abolition to become a political force for change. 

The political or the private pursuit of the doctrine of equality ends in ideological revolution.  The French revolution set an observable, repeatable, pattern of what happens when equality is pursued ideologically as a political end.  Lucifer and Cain are two of many biblical examples that the doctrine of equality darkens the hearts of both men and angels. Pity the unhappy souls that join them in their benighted covetousness.