I agree. Australia was one of the few countries which called for an investigation of all possibilities and the reaction from China was swift and furious. For most countries, concerns about trade and geopolitics outweigh everything else.
The US (and I would add France, which built the BSL-4 lab in Wuhan) has additional reasons not to investigate, as you said.
Not long after Australia pointed the finger at China, it emerged that Australian Government Labs had been doing gain of function research on bats ...
If the bar for proof of guilt is "swift and furious reactions" then by the playground court rules; "whoever smelt it, dealt it" and "whoever said the rhyme did the crime"
Ah of course I am parotting disinformation from the CCP, not quoting from statements made by the Chief Executive of Australia’s national science agency, CSIRO.
Perhaps your aggressive rebuttal was a sign of your guilt and complicity in the global pandemic.
Though your link doesn't quite say that, there are strong advocates of GOFROC (Doherty, Subbarao and others) at the Peter Doherty Institute, Melbourne. Moreover, one of the leading Australian virologists, Eddie Holmes, is a long-term collaborator of WIV and other Chinese institutes. But these facts by themselves are not indicative of guilt or complicity.
What has been missing is an independent investigation of both possibilities (lab related and zoonotic spillover).
The baffling reluctance of the US and China to call for such an investigation is very disturbing. However, to talk about guilt is premature at this stage.
The US (and I would add France, which built the BSL-4 lab in Wuhan) has additional reasons not to investigate, as you said.