A friend points me to a TNR article subtitled "The peculiar anger of Mitt Romney," and it's peculiar all right. There's a lot of theorizing about where Romney's anger comes from, but there's not much evidence of this supposed anger in the first place. Despite his long and public career, the piece is only able to dredge up four examples of Romney losing his temper over the course of 30 years. In fairness, three of those examples are from the past decade, which suggests that maybe he loses his temper once every two or three years.
Something tells me this isn't something to worry about too much. Let's get back to talking about his hair and his flip-flopping, OK?