If the brothers are following the climate over here, what good would it do to to grant interviews? Who'd believe them anyway? What's the point?..
sw
I read a lot of mysteries. I can't remember offhand which detective says it can be more informative if someone lies or refuses to answer than if they tell the truth. [It's a bad paraphrase. I think it's Nero Wolfe.]
Anyway, I think if a competent interviewer- someone who wants to find Natalee- makes the attempt, the Kalpoes could provide good leads even inadvertently. If there is remorse for the part they've played or a desire to clear their name, all the better.