Glen Whitman criticizes Al Sharpton for his theistic explanation of morality.
Yes, Sharpton's version of this is pretty bad. So why not debate someone serious, like Plato?
It is obviously just to act justly. But God is the greatest justice, the eternal form of justice itself. And it is absurd to claim that it is unjust to have to obey the highest realization of justice. Therefore, it is not unjust to have to obey God.
The argument often used against a theistic basis for morality, "I'm an atheist and I act morally" has no force against this form of theism: Of course, even someone who cannot see the pure forms beyond the cave mouth still can see a distorted image of them in the shadows they cast.