+1
Because it was meant to harken back to popular Scandinavian thrillers from earlier this decade (it was kind of late to capitalize on the trend here in the US, started by both the original and Fincher’s Dragon Tattoo movie.)
My point still being that the movie made clear it’s reasoning for its presentation and I don’t understand why you expect it to not be what it is. Jeez, I really wish we were talking about another, better movie that deals in a different culture and language but is presented in English for the obvious purpose of being aimed at an English speaking audience. Beasts of No Nation, maybe?