I don’t believe I understand your argument about risk. I believe you’re trying to say something like “people who cause warming are benefitting from costs they’re pushing on other people.” If so, I think you’re just begging the question. In any event, I don’t understand what you mean by “we need a better null,” but if you can clarify your position, perhaps I can respond better.
As for my “pronoiac proposition,” I’m sure you’re right that occasionally things shift radically, but I deny that you, or anyone else, has enough information to know whether warming, cooling, dumping CO2, or sinking it, is most likely to bring about, or prevent, the next radical climate shift. Absent that information, I deny that there is any blame to be had if my policies happen to trigger it.