I haven't read the original comics for the Dark Knight Returns, but I find the internal politics of it to be really... all over the place? The first movie clearly has a bone to pick with the youth, but the second movie is extremely critical of the Reagan administration. There's a lot more there as well, but both movies kind of come across as the ranting of a bitter old man, and I'm not sure if that's because we're following the perspective of the film or Bruce Wayne.
They're pretty wacky films, though. Fun stuff.