Philosopher Martha Nussbaum reflects on why fraternity, as opposed to liberty and equality, gets "short shrift" in liberal political thought:
I think liberals associate the cultivation of public emotion with fascism and other illiberal ideologies. But if they study history more closely they will find many instances in which emotions are deliberately cultivated in the service of liberal ideals. My next book, Political Emotions, will study all of this in great detail. Any political principles that ask people to go beyond their own self-interest for the sake of justice requires the cultivation of emotion.