To begin with, claiming that 80% of rap suspects are foreigners without statistical evidence is just propaganda. I think the reasons why that statistical data is no longer kept are pretty well explained in the article I linked. According the experts interviewed. the figures are pretty stable in the different researches made over the years, so maybe the importance of collecting that statistical data is relative. Anyway, despite data without elaboration can be manipulated for populist means, possibly it'd be better to have statistics. In any case the researches concluded that, while
a vast majority of immigrants have no connection with crime, the risk is higher among people born outside the country. However, it seems that it diminishes with second generation immigrants. Factors like age, gender, income and level of education have to be measured as well. because in all likelihood they have an impact in crime rates. Finally, an interesting fact is mentioned in the article: according to UK police statistics show a disproportionate amount of ethnic minorities stopped ans searched by the police. Possibly black people in the USA would gave something to say on the matter. I mean, we are talking about complex issues that need a more nuanced approach than that of Breitbart News or Mr Akesson. I hope that Swedes don't forget where SD come from...