I have ADHD. I would say injustice sensitivity is a major part of my personality. My husband says that's what he loves most about me. Much like you, I find it to be isolating quite often, so I don't necessarily see it as a bonus. He sees it as me being "strong enough to stand up for what's right," I guess.
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I get this too. When something unjust happens or even when I hear about it I get angry and feel the urge to speak up and do something about it.
It doesn't have to happen to me for this to happen. Not even someone I know.
Sometimes it's enough for there to be a rule or law of a system in place that could in theory lead to major injustices being inflicted on someone. I get angry about that too sometimes.
Its especially bad if children, animals or otherwise defenseless beings are affected. If such a thing is reported on TV like animal cruelty I have to change channels. Otherwise I get sooooo angry and I don't want that.
Oh, if it's defenseless beings, I get the big mad.