..either they're covering for him ...(I doubt an ex-wife would do that)...or he didn't do it, and simply wanted to be extradited to the US, rather than face prison in Thailand.
...my opinion
please explain the DNA match.
Karr would have become an accomplice of sorts if he kept that individual's identity secret.
>>(I doubt an ex-wife would do that)<<
I wouldn't doubt it. While, like you, I'm reserving judgment, the ex could believe that if he did do it, her life becomes a living hell from here on out on various fronts.
Pedophiles tend to run in packs. It is a very real possibility that Karr actually knows the details because the actual perp has told them to him directly, and he may be parlaying that knowledge into a free trip back to the US. Once on US soil, he could divulge the actual source in return for a deal on his other outstanding cases.
Lots of unanswered questions that we will hopefully be finding answers to in the coming days.
If he was researching the Ramsey/Klass cases how likely is it that he was preparing a cover for his visit to Thailand to sexually exploit children there and then if he got caught he was prepared with info to say he did it so he would be sent back to the US and not be sentenced to death in Thailand?