We don't know if the virus came from a market either, so why would that be the default position? Especially since that position requires accepting a hell of a coincidence that the virus just happened to emerge near a lab working on gain of function research for that type of virus. China's lack of openness to investigating this should also skew us against giving them the benefit of the doubt, rather than the opposite.
Given that lab escapes have happened multiple times and might have caused a global pandemic, the burden of proof should be on showing that the research is worth the significant risk it carries.
Defaulting to assuming that the risks are negligible and everyone concerned is scared for no reason is an absurd and dangerous take.