The problems of realpolitik are these: their nuances are not ours, and our nuances are not theirs.
The Iranians have chosen to hold hostages representing people opposed to George Bush’s policies in the Middle East. George Soros is no friend of Bush. What position does he take now that one of his own people is being held as a hostage against him? The Iranians, by doing so they, quite probably unknowingly (our nuances), make it hard for Bush’s opponents to continue attacking him.
Just as when the Bush government undermines moderates (their nuances) in Egypt or Iran they wind up reinforcing the extremists.