““There is never any confusion among competent speakers of English over whether who is subject or object. For example, consider the following questions: Who bit the dog? Who did the dog bite? Understanding is instantaneous and perfect whether you use whom or not. So, if whom is not natural and not needed, why do prescriptive grammarians insist we have to use it? Their reasoning is, in essence: we have to use it because we have to use it. They actually have no other reason.””
