IMHO, these types of people (referring to ultramarina's description of her DD above) are an important part of society because they are the whistle-blowers (when needed), strike leaders, people who have the guts to go up against things that might be legal but are morally wrong (for example, slavery).
There would never be any types of really important changes if there weren't, here and there, the type of people who not only recognize something that's really wrong but are so passionate that they're not stopped by worrying about what people will think about them.
It's sort of a hard personality to have but I don't see a Dx attached to it. It just needs to be "managed" I suppose and channeled.
It's tied into being an enforcer/punisher.
"Studies have found that social cooperation and punishment go hand in hand. In fact, punishment is often an altruistic act: Enforcers uphold fairness and order despite very real personal costs. Whether the punishment they dish out is just and warranted or sadistic, enforcers also face "social disapproval, public scorn, hardship, persecution, or death itself," writes retired army lieutenant colonel Dave Grossman, author of On Killing."
http://www.psychologytoday.com/articles/200904/field-guide-the-enforcer-the-punishers
