From herbrawt's link:
[The first and last paragraphs sum up the conclusion quite well.]
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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.
Ultimately, the results of Rothschild and Keefer's five studies were "consistent with recent research showing that outgroup-directed moral outrage can be elicited in response to perceived threats to the ingroup's moral status," write the authors. The findings also suggest that "outrage driven by moral identity concerns serves to compensate for the threat of personal or collective immorality" and the cognitive dissonance that it might elicit, and expose a "link between guilt and self-serving expressions of outrage that reflect a kind of 'moral hypocrisy,' or at least a non-moral form of anger with a moral facade."
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For the record, just because someone, . . . say, poor old DonDiego, f'rinstance, . . . comments negatively on ill-conceived and poorly executed Government policies does not necessarily mean he is not a Very Good Person. It could be the case, but it is not conclusive.