Perhaps the clearest symptoms that transcendent and transcendentalist accounts of normativity want their money for nothing are to be found in the vigorous defense of the is/ought distinction, the imprisonment of normativity in a transcendental subject completely independent of the body, the world and society, or the imprisonment of norms either in the mind of God or in a Platonic realm of the forms. In all these cases, transcendentalist (Kantian and post-Kantian) and transcendent (Platonic and theistic) construct a theory of normativity that carefully divorces norms from thermodynamic questions of work and labor. By taking the norms out of the world and treating them as non-existent yet nonetheless binding, transcendental approaches carefully separate normativity from the frictions of the world.
Incidentally related comments on 'changing human behavior (or not: the RealClimate post dealing with "misrepresentations and mistakes in the ‘Global Cooling’ chapter of the new book SuperFreakonomics by Ste[ph|v]ens Levitt and Dubner.'
Human nature – the desire to strive for a better life, our inability to think rationally when trying to impress the objects of our desire, our natural selfishness and occasionally altruism, etc – is very unlikely to change anytime soon. But none of those attributes require the emission of fossil fuel-derived CO2 into the atmosphere, just as they don’t require us to pollute waterways, have lead in gasoline, use ozone-depleting chemicals in spray cans and fridges or let dogs foul the sidewalk. Nonetheless, societies in the developed world (with the possible exception of Paris) have succeeded in greatly reducing those unfortunate actions and it’s instructive to see how that happened.
The first thing to note is that these issues have not been dealt with by forcing people to think about the consequences every time they make a decision. Lead in fuel was reduced because of taxation measures that aligned peoples preferences for cheaper fuel with the societal interest in reducing lead pollution. While some early adopters of unleaded-fuel cars might have done it for environmental reasons, the vast majority of people did it first because it was cheaper, and second, because after a while there was no longer an option. The human action of releasing lead into the atmosphere while driving was very clearly changed.
In the 1980s, there were campaigns to raise awareness of the ozone-depletion problem that encouraged people to switch from CFC-propelled spray cans to cans with other propellants or roll-ons etc. While this may have made some difference to CFC levels, production levels were cut to zero by government mandates embedded in the Montreal Protocols and subsequent amendments. No-one needs to think about their spray can destroying the ozone layer any more.
...again, politics, collective economic action... matters!