Of course it's true, no need for your generosity of fairness. Just don't obey the law and see what happens. Continue to do so and eventually you'll be looking down the barrel of a gun. Pointing this out is not Randian. It's just reality.
There are no nuances of living in a civil society when solutions are implemented by law. If it's by law, then it's by gun. I don't know of any law that works otherwise.
I think the nuance you're referring to is when people's minds are (actually) changed such that they work together on a common goal. There becomes a natural supply and demand of a certain behavior. But most of the effort that I see is not convincing people to support a certain shared goal per se, but rather to join a tribe to crowd source the passage of laws.
The more important thing to me - and the point I meant to make, though I didn't fully articulate it - is that pointing a gun at someone (or indeed entire sectors of an economy) should be reserved for situations in which there is a very high bar of confidence in the detailed facts and predictions of the outcomes. While we may all agree that global warming causes climate change and even that it is anthropomorphic, it doesn't appear to me that we have a level of specific knowledge to say that "a reduction of carbon emission by x will result in a climate of y in the year z". If we don't have that, then I question both the morality and practicality of what appears to be a witch hunt in the form of policy making.