As for the motives... IF the arrest of Anakata was a paid job, what other reasons than keeping good relations with the U.S. do we (or rather, the Swedish state) need?
A fair statement, but I'm not sure that nebulous 'good relations' are enough to explain the amount of time and money the Swedish government is pouring into what would seem, at least from a Swedish perspective, to be petty crime at best. I suspect there are much more specific gains being had, maybe officially through some kind of US concessions or accommodations, or unofficially. Certainly the RIAA and MPAA can open (and close) lucrative doors to Swedish media, for example.
As for the motives... IF the arrest of Anakata was a paid job, what other reasons than keeping good relations with the U.S. do we (or rather, the Swedish state) need?