The second point has to do with liability. If an article contains an error, but may not be corrected after a week, we will be liable. And this time, we wont be able to say "there is a incorrect statement ? Please, do correct it". Putting a correction in an attached page wont do it either. Because other sites will use our content, and they are not likely to bother go check error corrections mentionned in another page. This type of "correction" work well in paper journal. It just is not okay online.
Wouldn't the answer with these things be to have it protected, but editable by one level of user (be they sysops, bureaucrats, whatever), who could then correct any urgent errors?
-- ambi