You're in a thread that was kicked off with unsourced statements about virology and epidemiology, but suddenly we have an urgent need for sources — actually, no

You're in a thread that was kicked off with unsourced statements about virology and epidemiology, but suddenly we have an urgent need for sources — actually, not just sources, because the demand was for proof — when we encounter the idea "Labs don't occur by chance in random locations around the globe"? I would say you're supposed to engage the same way everyone had been engaging with the entire thread up to that point. But if you do want to transition to a more evidence-based approach to the subject — which I could get behind — I don't think the right way to go about it is to suddenly demand proof from the first person whose opinion you don't like.