Because the republicans have slowly but surely dismantled public education, and always prevented any media literacy initiatives to take root, while using religion to amplify these effects. There's a German musician named Reinhardt May who had the following line in his song "Sei Wachsam"("Be Aware"): (Edit: i realized a better translation to preserve the exact meaning would be "Be on your guard")

Der Minister nimmt flüsternd den Bischof beim Arm: Halt du sie dumm, -- ich halt' sie arm!

(poorly) translated:

The minister whispers to the bishop, touching his arm:
You keep them dumb, i'll keep them poor.

The song in its totality is now 30 years old, and can't be beaten in actuality.

https://www.youtube.com/watch?v=CdBo34ycvkw for a live recording, https://www.youtube.com/watch?v=CGjpz1feBsU for english lyrics.