I'm skeptical too. There is no hard evidence, but there is some circumstantial evidence (namely proximity). Sometimes circumstantial evidence can lead you to hard evidence if you follow the clues, which is why we can't yet dismiss it, but it's still important to keep it in perspective and demand hard evidence for any more authoritative claims going forward.

I agree that the intel community would share with us hard evidence if they had it, which is why I'm suspicious of a frame job. It would be easy to simply release a virus near your intended scapegoat.