Usual suspect, usual throw away socialist quote.
I'd like to hear a modern politician say, "We will hunt this bastard down and when he is caught, hang him from a streetlight."
I believe you are wrong with this one. Roland Koch (fortunately) is one of the most conservative politicians this country has to offer.
And the Frankfurt police is no stranger to harsh methods - they got in big trouble a few years when they threatened a child kidnapper with torture.