It is to celebrate the 40-year jubiliee of the twinning of Bad Godesberg with the Turkish town of Yalova within the framework of the current town festival, where a delegation from Yalova is present. So flying this flag is, mind you, OFFICIAL. A cursory online search seems to indicate that the German flag code remains silent about the flying of alien national emblems. But is everything that is not explicitly forbidden allowed or even advisable?
The renowned German professor of ancient history and classicist Egon Flaig wrote 2006:
"Then we want the flag of Islam to fly over those lands again, that once had been lucky enough to be submitted to the rule of Islam and having heard the call of the muezzin praising God. Then the light of Islam died out and they returned to infidelity. Andalusia, Sicily, the Balkans, Southern Italy and the Greek Islands are all Islamic colonies which have to return to the fold of Islam. The Mediterranean and the Red Sea have to become inland seas of Islam, as they used to be". These are not the words of Al Qaeda, they were taken from the programme outlined by the founder of the Muslim Brotherhood, Hassan Al Banna, in a speech. The Brotherhood has millions of followers today and reaches out far beyond Egypt. Their intellectuals are working in Europe and the United States; they count as "moderates" and are treated as such by the media. Planned re-conquering of "lost" territories are part of the agenda of states that are fighting for territorial dominance. How can it be part of a religious programme? Is Islam a religion like any other religion?Maybe deeming the reading of classics or ancient history as obsolete was a mistake. But then, I guess it's just the sheer and undiluted German love for totalitarian ideologies that lets them do what they do.