My own experience: Don't ever trust the Chinese government on issues that could potentially involve the reputation of the party. Note that I'm not saying don't trust what CCP says, ever (sometimes they actually do good things) - just not on issues that involve anything to do with how the world might perceive them.
Which is exactly what this issue is about.
That's not to say we have compelling evidence that this was a lab virus, either. I think, for me, it's a, "we don't know, but I wouldn't be shocked at all if it was a lab virus".
Why is it never brought up that it could just be an accident? It doesn't need to be a weapon. Just poor safety during research.
Then a small group favors their stories to happen because of malicious intent. Like saturday morning cartoon villain style of obvious evilness. And that is often mixed with a "them (evil) and us (good)" type of self-assertive tribe behavior as well as the bitching and bickering that stems from relating social status. (USA and China are not humans, they are nations, but people anthropomorphise them)
A story about poor standards and accidents is more about empathy and carefulness, and while a wise man might tell it to his children, it is not the thing people gossip about. Everyone agrees that bio-labs should have highest standards and that is it, there is little difference to "it happened randomly", and more importantly there is little blame and fame. Have you heard what <china> did? has another ring to it.
The human mind operates on stories, not on facts. Working with facts is hard and even the most pious intellectual can and will fall prey to nature. So it is no wonder that the most scandalous stories are the ones that get around a lot.