David asked:

What is righteous anger and where does the term originate from?

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The vast majority of people are right handed. Accordingly language, which (according to the great
philosopher of language, Wilhelm von Humboldt) is a "sediment of experience", mirrors in numerous
guises the "rightness" of rightness: rectilinear, rectify, director, upright, shipwright, legal rights,
dexterity and so on. In German "Richter" (righter) means "judge". "Dexter" is occasionally used as a
name. But when you fear the devil behind you, you look over your leftshoulder.

So "righteous" anger (or anything else in that context) reflect a desire or need or determination to
straighten the crooked, fix the foul, upbraid the false.

Jurgen Lawrenz

Sydney