Do you think Plato would have befriended Nietzsche?
If Nietzsche holds that
To create a new heaven and a new earth, one first had to destroy … the former highest values
then for Plato true values are eternal and immutable ideas, such as goodness, beauty and justice. They are not the creations of man but patterns to which the human soul must ascend. Virtue does not change like the opinions of the crowd; it is one and everlasting.