Nah, they just have to do more work to ensure the law is clear enough to not attract too many challenges. Letting a government decide in the face of ambiguous,

Nah, they just have to do more work to ensure the law is clear enough to not attract too many challenges. Letting a government decide in the face of ambiguous, poorly written laws is so obviously a wrong thing, that you wonder why the original Chevron decision was made. It really is the other side of the coin to "ignorance of the law is no defence". It is incumbent on the govt to make the law as clear as is reasonably possible.