Well, Ok, Rammstein is Schocking.
And yes, they had used Propaganda material.
But in this Musicclip (Stripped) there was material from the Olympic Games in Germany as well as material from Stalinistic Propaganda (Didn't know if you have seen it.
The Mass of Women, making gymnastic, thats Russian Propaganda).
I think they take the material for two reasons:
1. Because of the Asthetic.
The Material is Propaganda, but it has his own beauty.
2. They wan't to shock.
How do you scare and get attention.
Make something on the borderline of good taste.
And, to clear it out, I will bring you a parable:
If you make a movie, are automatically like the material.
If you make horror movies you are scaring?
Propaganda-movies you are a Patriot?
Lem's has written in his first books thinks he don't though. But he didn't believe them.
And if Rammstein had sad, not all Nazis are bad, they mean: Respect your enemy