[TheMercenary]

Originally Posted by footfootfoot

I had always hoped the speaker was being sarcastic or ironical, or even sarcastical when they said "I could care less"

But I suspect it is the result of people hearing the speaker roll over the ending of couldn't so it comes out sounding COULDn't and then, because they are illiterate or just American, they assume what they heard was correct because they always hear everyone saying, ignoring that they are the common denominator and that they tend to hang out with their peers, who likewise make the same assumptions.
Maybe.

I could care less... Pedantic occupiers.