Pertinent quote from the results section of the publication:
Most people who come from a socio-economically less favorable background do not commit more crime than people who come from a more favorable background, and it also happens that people from a more favorable background do commit crime. This means that even if there is a connection between socio-economic background and involvement in crime, that connection is weak. It is not possible to appreciably predict who will commit crimes based on knowledge of people's socio-economic background.
https://bra.se/publikationer/arkiv/publikationer/2023-03-01-socioekonomisk-bakgrund-och-brott.html
I've been saying for years that the poverty/crime relationship was inverted from the commonly accepted causational relationship, that crime causes poverty. Poverty itself is a learned behavior, it requires making bad life choices over and over again for it to happen.
This result is not a surprise to me.
It is pretty simple, all one needs to do is compare the crime rate of white, poor Appalachia to black, poor inner city Chicago. The results speak for themselves.
This is not to say that Appalachia whites are a non-violent lot, because they most certainly are not. The scale is vastly different, though.