Can anyone quote (and source) an example of a respected linguist actually using “could care less”–rather than discussing its use?
If respected linguists, or respected English-users of any stripe, have ever actually used “could care less” to describe their own mental state or the mental state of another person–as opposed to discussing the usage–then we may rest assured that “could care less” is just as Standard as is “couldn’t care less.”
Clearly, quoting other speakers would not count as a personal use of the phrase, no more than does opining about the usage itself. The challenge, therefore, is to come up with a documented example of Pinker, Zwicky, Liberman, or any other respected English-language professional using “could care less” to express their own personal reaction.
This thread’s one and only citation of the use of “could care less” by someone generally respected as a speaker of English, was a link to a Google Books page from a transcription of Bill Clinton’s speeches.* A further challenge for those who believe “could care less” is SE, then: to provide either proof that this is not a transcription error (such as a copy of the speech in Clinton’s handwriting), or to provide other documented instances of Bill Clinton using “could care less” to express his own or another’s feelings.
(If he regularly uses the phrase to convey personal reactions, then of course the appearance of the phrase in the book of speeches gains in credibility. On the other hand, if there are no documented instances of Clinton using the phrase other than the speech-book appearance, then it is reasonable to consider the possibility that its appearance there is the result of an error in transcription.)
Users of a language have a right to know what is considered Standard usage by those who are accorded respect specifically for their expert use of that language. Speakers of a language have a right to know what, at any moment in time, is considered to be an indicator of such language expertise–and what, at any moment in time, is considered to be below the standard.
To assert that this information should be kept from language users–perhaps by means of an assertion that ‘rules are for pedants; rules don’t matter since language is ever-changing**’–surely does the users no favor.
*in post 159.
**It is ever-changing, of course. And “right” and “wrong” are meaningless concepts with regard to usage. But there remains, at any given moment, usage that is Standard: that is, what the acknowledged experts use themselves. And then there is usage that is non-Standard: what the acknowledged experts tell non-experts they shouldn’t worry about, because hey, it’s all good.