Could be that Cunningham (in article) is right, ie. that arranging detention/extradition on a child porn charge was not do-able, but basing it on a murder charge would guarantee the desired result.
Could be - and perhaps they were fearful of him fleeing or hurting another child. It just seems like, given all this time, they could have established a few facts that would have at least made it possible for him to have been responsible. I guess we'll know soon. My initial impression from hearing him is that he is a pedophile who may fantasize about the death of young girls - thus the obsessions with the various cases. We know he didn't kill the Klaas girl. There are a lot of unanswered questions, that's for sure (was he there, how he got in the house, how he got out, the ransom note, etc.).