It's interesting you would say SMT's message is Humans Are The Real Monsters when Neutral (Humans Are The Bestest!) is clearly the preferred option for the series.

Secular Humanism, love your fellow man and beat the trout out of all demons, that is the message SMT really wants to convey. I totally disagree with that message though and am glad the game gives me options if I do disagree. But you still get the feeling going Law is kinda like blowing up the Brotherhood of Steel in Fallout 3. Sure you can do it but the developers don't want you to. They clearly have a preferred path built around what they think and that takes precedent over what you think.