There's pretty suspicious circumstantial evidence that SARS-COV-2 came from the Wuhan Institute of Virology: https://www.vanityfair.com/news/2022/03/the-virus-hunting-nonprofit-at-the-center-of-the-lab-leak-controversy
EAs are really concerned about engineered viruses leaking from labs.
Why isn't the lab leak hypothesis discussed on the EA Forum?
(thoughts my own)
People discuss this in private a bunch, doesn't seem valuable to discuss it in public unless someone has additional important-but-nonsensitive information.
Also in general there's various reasons (some very good, some meh) that biorisk people mostly eschew the EA Forum for serious object-level discussions, and prefer private online and offline spaces.
Absolutely, especially for Europeans in general, not just new people. But there's tradeoffs, the risks involve some topics that definitely shouldn't be discussed openly, and lots of Very Serious People seem to have decided that lab leak discussion should be mostly in-person.
I recommend cold calling. I PM'd ChristianKI on Lesswrong a few months ago and got some good info on this topic.