There's a difference between a team collectively losing you points and an individual literally gifting goals to the opposition, though, isn't there? You can point to multiple specific occasions with Keane where he has turned wins into draws, draws into losses and sometimes even wins into losses. Of course we'll drop points, even the ridiculous Man City teams dropped points, but to willfully keep a player that you know will personally and individually be the specific cause of dropped points makes zero sense to me.
Some players in a squad with the resources we have will be a bit rubbish, we all know that and can live with it (except immediately after a disappointing result). Keane isn't a bit rubbish, he's a bin fire. He makes everyone around him worse. Get shut.