This is about two things: transparency and breaking a problem down into bite sized chunks. Transparency because it makes it clear WHY a website cannot be served to the user. Bite sized chunks because, taking Maxx Daymon's comment as an example, if courts do start forbidding the use of the 451 code, then people can start campaigning about that - which would then be a more specific (and smaller) change to bring into effect.
Still lots more work to be done though. :(