(Adding): it’s not surprising that the inter-racial homicide rate is very close to the black-couple rate, since most inter-racial couples seem to be white-woman/black-man, and the male commits 77% of domestic homicides (according to the first link in my prior post)
You inserted the modifier “much”, that is a misrepresentation. You also assert based on your observations that white woman/black man relationships represent a majority of those studied - that information is not given. Citing scientific papers is fine, but don’t read into them things that aren’t there.