If you priced everything according to the negative externalities they cause, you would have poor people unable to afford $10/gal milk and probably pay more than the dairy farmer subsidy in healthcare costs related to poor nutrition for this entire class of people. I think nuance is needed, but the danger is that this nuance is where industries see opportunities for regulatory capture. Sometimes I think the American political system is too brittle with too much of a focus on who has the most money in the room to perform needed change. Everything in recent decades seems to be a half measure that comes too little too late.