Us vs the lawyers
You know, he's got a point. Isn't American society already litigious enough, without adding another law that people can get into petty arguments about? Imagine flying at 355 ft, and then getting dragged into court because it turned out your GPS had a 6 ft vertical margin of error (remember, vertical accuracy is significantly worse than horizontal). I know my little GPS logger was regularly off by ten meters, if not more.
Yes, we want to prevent intrusions on privacy, but I agree we should try to do it without creating a new avenue for lawyers to get rich.