Err, because I wrote a post that was on-topic regarding the discussion here, and then was told that a difference in pronunciation between the two words is non-existent in the US. If Dexterone one day goes on to become an English teacher, it's important that he's aware that the merger doesn't exist in a very significant portion of the country.
Also, this "caught" / "cot" debate is kind of asinine. Lots of people in the US pronounce those two words the same way. Lots. Why does how many need to be quantified here?