>they were trying to engineer a variant of bat coronviruses that could cross into humans.
Right, because bat coronaviruses very famously have never crossed into humans. Google "SARS-CoV-1".
Right, because bat coronaviruses very famously have never crossed into humans. Google "SARS-CoV-1".
SARS-CoV-2 was not only not engineered to bind to human receptors, it was not engineered at all and there is no credible person or source that makes this claim.
Oh wait.
"Although the structure of the SARS-CoV-2 and SARS-CoV S proteins are similar, the binding affinity of the SARS-CoV-2 S protein to the ACE2 receptor is much higher as compared to SARS-CoV, which may account for its increased transmissibility."
The issue here is that for many people taking your position, making the claim makes you not credible. By definition, there can be no credible source making that claim, because to make that claim revokes your credibility.