 Unless we are skeptics or opponents of closure, we would have to concede that this argument is sound. It is valid, and its premises are true. Yet few philosophers would agree that Counter BIV amounts to a satisfying response to the BIV argument. It fails to explain how one can know that one is not a BIV. The observation that the premises of the BIV argument are less plausible than the denial of its conclusion doesn’t help us understand how such knowledge is possible. That’s why the Moorean response, unsupplemented with an account of how one can know that one is not a BIV, is widely thought to be an unsuccessful rebuttal of  BKCA.[63]