First, even genetically-engineered viruses (i.e., viruses whose nucleic acid sequence was directly manipulated by scientists) are genetically similar to natural

First, even genetically-engineered viruses (i.e., viruses whose nucleic acid sequence was directly manipulated by scientists) are genetically similar to natural viruses--scientists lack the knowledge to design a viral genome entirely de novo, so such activity starts with one or more natural genomes. I believe other evidence makes such an origin for SARS-CoV-2 unlikely, but the existence of natural relatives means nothing. Second, are you really saying that if we somehow later confirm that SARS-CoV-2 is a naturally-evolved virus sampled and accidentally released by the WIV, we should just shrug and do nothing? Even before the pandemic, there was a debate over whether deliberately seeking out novel pathogens (especially for gain-of-function experiments, but even just for collection and sequencing) brought sufficient benefit to justify the risk. If it turned out that such activity started a pandemic that killed millions of people, wouldn't it perhaps be worth revisiting that tradeoff?