I think there are parts of his brain that are, for god knows what reason, too clouded to accept the realities he does not like. Instead, he gets fixated on the things he does like and can understand. In this respect, the repetition is not just about simple propaganda but also points to the limited nature of his comprehension and engagement. 
I am rather heartened by Amy Siskind and others who keep fighting, keep watching, keep resisting. 