

Ultimately, it’s of mostly academic interest. Where do we need to tighten down on things to avoid a repeat incident. The best answer would be “Both”.
Also, do you have a link to any papers talking about the man-made origin theory? I’ve not checked in a while, but last time I looked it sent me down a lot of rabbit holes, with nothing ultimately backing it up.
They did eventually participate. While their initial behaviour wasn’t the best, I also understand why they dragged their feet. There was a definite witch hunt going on, for someone to blame. Once that calmed down, they did actually help with investigating it.