He doesn’t fine a shred of evidence that Dreyman is disloyal. Not even in whispers. Not even in guarded allusions. Not even during pillow talk. The man obviously believes in the East German version of socialism, and the implication is that not even the Stasi can believe that. They are looking for dissent and subversion because, in a way, they think a man like Dreyman should be guilty of them. Perhaps they do not believe in East Germany themselves, but have simply chosen to play for the winning team.