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 for explanatory mechanisms, I tend to favour explanations from economics and systems-based sciences
Fair enough. As you noted, the risk with any analytical framework is that it intentionally or unintentionally becomes a single variable analysis - and thus useless. My sense is that economics applied to social interactions is particularly at risk for this type of problem - leading either to Marxism or blogosphere ev. psych.
...It wasn't intended as a trap. Part of the point of the hypothetical was that "sword-privilege" is a bit of a silly i
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.