> Right, because dictionaries are supposed to tell you the one, true meaning of a word, and never the meaning of a word that the person using it actually intended.

You were intending to be sarcastic, but I agree with your sarcastic exaggeration wholeheartedly. Dictionaries are supposed to tell you what words actually mean, not list how they can be misused. If someone intends a word to mean something it doesn't, then that's erroneous, incorrect, mistaken, and even wrong. In today's culture, where people will go to inordinate lengths to bend absolutes so as to turn failures into personal successes ("It's right if it's right for you"), this is an unpopular fact, but it is a fact nonetheless, and a valuable one besides.

> Why, the latter could almost make a dictionary useful for more than just settling subtle and obscure points of word definitions. ;)

Right -- it would have the bonus use of telling people what they already think they know. The former, on the other hand, is useful for encouraging English to be something understandable without reading the mind of its user to figure out what he or she *meant* to say.