I am not saying that I am in favour of "manmade positivistic law" (of course it's overbearing and heavyhanded), but I thought J.C. said to render unto Caesar that which is Caesar's. My interpretation of that is that all manmade governments are intrinsically crappy and we have to accept that as we can't change it. If it's not Caesar abusing people 2,000 years ago, then it's today's democratic governments who are. JC's kingdom is "not of this world", so why worry is what he was saying about imperfect, manmade governments.