Who is saying Murphy and Arnold are problems? There is a difference between disagreeing with an incremental decision each of them might make like (playing, keeping on the 26 certain players), but some people act like any constructive criticism is a demand someone be fired.
objectively we can all agree that Rengifo & Perkins being on the roster have cost us games, and Frelick and Ortiz have both struggled.
similarity, we can all agree that injuries have forced Sproat, Gasser, Crow, and now Drohan into the rotation with some success but significant struggles as well.
part of the fun of being a fan is being optimistic about how we can get better (especially in our case) without severely mortgaging the future.