Right, but labmath said:
"To say it it applies universally regardless of the actors brings it into the same realm as something like gravity"
In that gravity applies whether humans exist or not. The same cannot be said of morality. This has implications for the definition of a 'universal principle'. For instance, professionalteabagger seems to be having trouble accepting that gravity - applying, as you point out, to all matter in the universe - is a universal principle that exists regardless of actors, is different from a moral universal principle, which is dependent on the existence of actors. It would seem that should they not accept the 'universal principle' it is by definition not universal... in the same way, paradoxically, that if some matter did not obey gravity, gravity would not be universal either.