Freedom of Travelling!

"German authorities have prohibited foreign travel by a far-right-wing lawyer, Horst Mahler, amid fears that he may attend a Holocaust denial conference in Iran." Expatica's German
It's interesting to see how one stupid act leads to another. The German authority said that they want to prevent "gravely damage [to] Germany's honour." And of course "German passport laws allowed the withdrawal of travel papers in case of danger to German interests." However the Iran situation seem to be very serious that Germany is even willing to take a risk on such action as confiscating its own citizens passport. Is Iran gonna be kicked in the ass soon?