So? Do you believe they entered the drug trade because of their names? Do you think there would be no drug trade if their grandparents weren't admitted to Sweden?

not OP, but I do believe that drug trade wouldn't take place to this extend without the immigrants.

I've lived in Finland decades ago and it was very different from where I came from - clean so to speak. Even in Helsinki Weed was hard to come by. No weird guys lurking on corners and all this scum one encounters in big cities in the wrong districts. There were no wrong districts. Scandinavia is/was (?) a different culture also because it was not riddled with such untethered people.

I think it's really hard to separate things like immigration from other things that might have influenced the availability of drugs, say vast increases in international trade that make smuggling much easier, that happened over the same time.