I mean, it's not a very interesting research topic? People who are poor and young commit certain categories of crime more often. That has nothing to do with immigration or race or whatever.
It has everything to do with illegal immigration because illegal immigration is a constant influx of people that are within the "right" demographics for crime (young, male, less educated, less wealthy etc). If you change the demographics of a country to add poor young people every year, you get a higher incidence of crime by definition.
I mean, it is? It's the most divisive political topic at the moment and the reason why populisms are on the rise? If anything, I'd expect more and more detailed studies on that?
Trying to prove correlations between race and crime is literally the historical basis of criminology as a discipline. They failed, it's stupid, and now people know better.
You can commission as many studies as you like on astrology, and they'll all be meaningless.
If you read the thread, you will find that this is not about the correlation between race and crime, but about the correlation between illegal immigration and crime.