If Obama yelled at his press conferences, kicked over the lectern and generally unfurled the Bruce Banner, the various news personalities would have more to talk about besides the fact that he refuses to do exactly that. It's not clear that such a display would, over the long term, move Obama's poll numbers a whit. I suspect the assembled personalities are concerned with numbers of their own. This is their right. It's also our right to wonder who this proposed tantrum would actually benefit.
Obama will be knocked by the partisans whatever he does. I have no issues with his handling of the oil spill so far. He's an adult, unlike many of his critics.