Your argument rests on the fault assumption that in a 'wide range of media', the median publication is unbiased and things that are more left-wing than it are b

Your argument rests on the fault assumption that in a 'wide range of media', the median publication is unbiased and things that are more left-wing than it are biased and things more right-wing than it are biased in the other direction. That's just not based in reality. In reality, almost all mainstream media is incredibly biased towards the status quo.