Bringing in Billy Wagner in a 4-0 lead is liking inviting a recovering alcoholic to a keg party

Where is it written that the "closer" must come in in the last inning, even when the previous pitcher is way more reliable? The very reason one would bring in a closer is because he is unhittable and better than the previous pitcher. If you know the closer is suspect, why do you bring him in? Bringing in Mariano Rivera is always an excellent decision because he is lights out. There are many closers who are not. If managers would just remove closers when they fuck up, maybe they would wise up. Jim Leyland wouldn't stand for the shit that Wagner does. Randolph has to make a stand against Wagner. Oh no, people would say, if you do that you'll destroy his confidence! What confidence does he have now? He can't be any worse!! If you yanked him once, I GUARANTEE that he would get every batter out for the rest of the postseason, because closers have egos and that's what powers them. If you don't challenge them, they suck like Wagner!!!!