[QuantumIguana]

Yet when someone says "I could care less", the are communicating effectively, people understand what is meant. Therefore, it is false that communication and meaning is made void. People do use non-standard English, but they do so, they aren't failing to communicate. Language doesn't change because some committee decrees it, it changes by what people at the time will call errors.

An idiom is a phrase whose meaning cannot be deduced from the component words. "I could care less" is one of those idioms. If you want to stomp this idiom, good luck. Maybe you'll manage to do it.