>> Look more specifically within mixed countries such as the US, and our black and Hispanic figures mirror those of black and Hispanic-majority countries, and Asian and European, the same <<
True enough. Yet the very great mystery remains that not a single one of the recent mass murder incidents in the USA was carried out either by (a) a black person, or by (b) a female of any race.
Figure that one out and you’ll be awarded next year’s Nobel Prize in Psychology!
You did have the DC snipers, but the female answer I would guess is pretty straightforward: lower testosterone, lower levels of relevant drug treatment, plus a lower incidence of the typical forms of mental illness involved.
We are still a majority white country, so I’d think a majority white expectation might be expected. But I think above average intelligence seems to go with the profile for this sort of premeditated thing. We’re dealing with still quite low numbers for statistical averages overall, but just with one such shooter, I doubt that Asians would be or are underrepresented even though Asian men on average have a slightly lower average testosterone level.