OK, kleinbl00, what rustles my jimmies is the word homogeneous. I'm so rustled that I actually bothered to register a new account because I couldn't remember my old one.
See, the table your source lists only accounts for 1st generation immigrants. 2nd, or nth generation immigrants are going to be included in the top category. So it doesn't give a very good picture. For example, 20% of kids under 7 years in the capital area have a foreign family background (Sorry, it's in Finnish only and as a new user I'm not allowed to post links, so here's a manual source link: stat.fi/til/vaerak/2017/02/vaerak_2017_02_2018-06-20_fi.pdf). 18% of people living in Vantaa have a foreign background. Third+ generation immigrants are no longer counted as having a foreign background, so 18% of Vantaa residents are 1st or 2nd generation immigrants. Sure, it's not as diverse as the US in terms of Mexicans per capita, but certainly that's not homogeneous by any stretch.
I can accept you calling the countryside, where 60% of ethnic finns live, homogeneous. But I find this irrelevant, partly because the police doesn't want to waste their limited resources on sitting by empty roads, and partly because there's not going to be any Mexican driving a Porsche around there anyway.
> If you get pulled over in Finland, it's because you're speeding
While the police is generally very professional, racial profiling is still an issue (English, check it out: yle.fi/uutiset/osasto/news/study_ethnic_profiling_in_finland_continues_despite_legal_prohibition/10142700).
> Nobody in Finland has ever heard "sorry, sir, I thought you were Mexican"
This is likely right, but "Sorry, sir, I thought you were Russian" probably isn't.