Well, it's a matter of semantics but by saying they couldn't care less they are literally saying they don't care at all. If they had any care at all, even if it was just a little, they could care less. The only way to not have an opportunity to care less is to not care at all.
That's why people get annoyed when people say "I could care less" to mean the same thing you mentioned.
Edit: Actually as I thought through this (I'm bored tonight), I'm inherently wrong and you're right. This has been discussed frequently in the "grinds your gears thread" but more to the angle of people who say they "could care less."
But it isn't impossible for someone to say they couldn't care less while still caring to a degree.
Interesting web we weave.

Comment