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
Yeah was it though? I was looking up crime stats to fact check that "lead causes crime" thing and it turns out in the 1920s there was as much crime as the peak of the supposedly lead-induced crime wave.
Probably have to go to the library of congress and actually read a book to find out the demographics, but I have a hunch...
Also found out the number of black vs white lynchings was virtually the same demographically as today's violent crime ratio - at least in OK. And the Tulsa thing where a functioning black area self-destructed over nothing basically, pretty much identical to Detroit a year before Civil Rights Act.