You apparently don't know how to research, Max. 'Blenderizing' as you put it is literally the ONLY way to effectively eliminate cultural effects from creating noise in the study. As long as there is a cultural correlation to race, the two are going to continue to be inseparable in terms of judging genetic factors. It also happens to be the only way to eliminate 'forcing' effects caused by perceptional skewing (like the assumption that criminality is genetic as opposed to cultural, to any large extent).
Wouldn't you rather see a world where people are judged on how they actually ACT rather than on bad proxies like skin color? Or do you actually want to be a racist?
No offense but you seem to be making the same mistake others are making and seem to be equating skin color/race with culture. To be honest, I am a bit confused by what others (not you specifically) mean by 'culture.' It seems to be a proxy for how closely one adheres to stereotypes about how white middle class people supposedly act.
Certainly you are aware that there are black and brown and Asian children being raised in white families. Surely you are aware that new immigrants from various nations in Africa have different experiences than black Americans whose ancestors were brought over here as slaves.
'race' really isn't a thing, and I use the word as an expedient to describe a complex set of genetic factors with an effect on appearance. When I say 'culture' I mean a self-segregating community which oftentimes picks some arbitrary genetic trait or familial relationship or geographic location as an identity. Oftentimes these communities seek to keep people who share their selected 'identity traits' from having values or interactions foreign to the community.
Oftentimes these cultures have extremely deleterious values that they pass onto their children. Disrespect for all law, aggression as a problem-solver, irrational reverence and protection for 'community' values (that's OUR music, you can't sing it!; I Better not see you wearing those Other-Culture hairstyles!). Sometimes those values are even worse, sometimes they are actually evil, such as veneration of murder, robbery, and human trafficking.
However, I realize that every one of the terrible people I run into from day to day could just as easily be 'white', 'yellow', 'red' or any of the other variations on skin tone or familial descent, if raised by the same parents in the same environment, with the same resources. They just would lose their arbitrary 'racial' identity, and cultures would no longer be able to assume that physical traits MAKE people awful.
The thing is, that we don't really know if those physical traits have any comorbidity with a predisposition to be awful. And several generations after denying all racial basis for cultural enforcement, we might still see an effect that is actually correlated with race, and then we can eliminate or treat those effects without people being ASSUMED to be bad just because they have outward expressions of their ancestry.