[csande17]

Right, I guess you'd actually want a measurement like "murders per population density" or "murders per (person per square mile)". Or, as it's more commonly known, murder-hectares per capita.

Murder-hectares per square capita? Murder-capitas per hectare? I'm not actually sure how the dimensional analysis works out.

[twic]

This is absolutely absurd. We're talking about the US here, so it would be murder-acres, and that just sounds like a country club you really shouldn't join.