I was looking for a nice definition of realpolitik in English, and I go to this post and this blog. I haven't checked the video referred by the post by myself, but in it, a Muslim preacher in a Mosque located in Germany says:
These Germans, these atheists, these Europeans don't shave under their arms and their sweat collects under their hair with a revolting smell and they stink... Hell lives for the infidels! Down with all democracies and all democrats!
Reminds me of the sad events that happened in the Netherlands regarding the murder of Theo Van Gogh. It is sad that in a country so tolerant the intolerant find a place to preach their hate.
My view is that the video exposes what the extreme right of the Islam thinks about the rest of the world. First clue: It is not at all different of what the extreme right thinks, regardless of country or culture: My cause is the cause of god, yours is the cause of evil. Second clue: Extreme ideology is self-justifying, and once you are inside, you just can't see the alternatives.
This is the reason that the owner of that blog chooses to think his biased politic view can be categorized as realpolitik. While I appreciate that he is not as extreme and cartoonesque as the preacher, I think it cannot.