Why does Plato argue that divine commands can never be genuinely moral commands? Do you agree?

From the Euthyphro dilemma, Plato argues that divine commands can never be genuinely moral. The divine commands are those belonging or coming from God. This argument stems from the idea that because God is omnipotent, omniscient that he will punish us when he detects any failures. Thus suggesting that the fear that motivates us to follow such divine commands is not a suitable motive to a certain moral action. Another argument that Plato presents is …

…standards which has been placed within our nature thus allowing humans to distinguish between right and wrong. Without a God, morality cannot exist independently as there is no one to determine the right and wrong of a certain action. God's holy nature is what makes him God and he does not succumb to the temptations such as imperfect humans, thus he is able to create such a standard of morals for imperfect humans to follow.