from Elizabeth Nolan Brown at reason.com:
When people publicly rage about perceived injustices that don't affect them personally, we tend to assume this expression is rooted in altruism-- a "disinterested and selfless concern for the well-being of others." But new research suggests that professing such third-party concern—what social scientists refer to as "moral outrage"-- is often a function of self-interest, wielded to assuage feelings of personal culpability for societal harms or reinforce (to the self and others) one's own status as a Very Good Person.
Outrage expressed "on behalf of the victim of [a perceived] moral violation" is often thought of as "a prosocial emotion" rooted in "a desire to restore justice by fighting on behalf of the victimized," explain Bowdoin psychology professor Zachary Rothschild and University of Southern Mississippi psychology professor Lucas A. Keefer in the latest edition of Motivation and Emotion. Yet this conventional construction-- moral outrage as the purview of the especially righteous-- is "called into question" by research on guilt, they say.
Feelings of guilt are a direct threat to one's sense that they are a moral person and, accordingly, research on guilt ﬁnds that this emotion elicits strategies aimed at alleviating guilt that do not always involve undoing one's actions. Furthermore, research shows that individuals respond to reminders of their group's moral culpability with feelings of outrage at third-party harm-doing. These findings suggest that feelings of moral outrage, long thought to be grounded solely in concerns with maintaining justice, may sometimes reflect efforts to maintain a moral identity.
The entire post can be read here.