That's an interesting idea Adeipho, but why do you think that the devil thinks he is right? He never got the veil so he must know that he is trying to hurt our relationship with God. He must know that it's evil to do that, but he does it anyway. It seems to me that he is making a very deliberate choice to be evil.
(I could be a brat and prove that a right angle is 90 degrees, but I won't.)