It's not an ad hominem, it's an attack on his credibility. He does not assert it's impossible to engineer a virus without markers he points to two reviewed stud

It's not an ad hominem, it's an attack on his credibility. He does not assert it's impossible to engineer a virus without markers he points to two reviewed studies saying known techniques will leave telltales. Like I said, it's evidence against lab leak but not conclusive. His entire argument is very straightforward. Zoonotic origin is highly plausible, has caused previous SARS outbreaks, has no evidence against it. Lab leak is possible, though it has no precedent and there's evidence that makes it less likely. There's no conclusive evidence for either. The balance of evidence and history leans heavily to zoonotic. There is absolutely nothing anyone has said in this thread that he didn't directly address nor anything that weakens his argument. Anyone on the lab leak train right now is basing it purely on bias.