Does it not seem odd to you to view the case of an unarmed person being stabbed by an armed assailant as an issue of social justice by default? . . . This is perhaps an unfair question . . .
Perhaps? :)
I choose not to fight your hypothetical and you get upvotes for closing the trap. Not a big deal, but not cool.
more appropriate explanatory mechanisms exist.
I'm interested in hearing about them, and using them to figure out how to be more effective in figuring out what social changes are better for my terminal values and causing those changes.
Edit: Also, let's not forget that there are high status locals who deny that the problem we are talking about even exists.
It wasn't intended as a trap. Part of the point of the hypothetical was that "sword-privilege" is a bit of a silly idea, and not an obvious go-to choice for reasoning about people stabbing other people. I genuinely didn't expect you to put up a defence for it.
As for explanatory mechanisms, I tend to favour explanations from economics and systems-based sciences, as they have a rich catalogue of unusual behaviour patterns that arise from interacting parties being given different choices. I'm generally quite cautious in their application, though, because it doesn't take much for an elegant and aesthetically-pleasing model to be subtly wrong.
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.