It's called an evolving language. "I could care less" is SO widely used that it has become a synonym. I'm well aware of how this technically makes no sense in like a mathematical way but that's the beauty of language - unlike the political opinions of many, language evolves and changes.
Beyond that, it's not the discussion at hand. This thread is dedicated primarily to determining whether Nike or NB is the better shoe, so please try to stay on topic. Thanks.