As for the left, well I am not sure there is an official position other than waiting for more data. China is definitely sus but they are always like that from a western perspective so I don't know that I weight it much.
Other than the smugness in watching the right be wrong again, I am not aware of anyone on the left that is invested in either outcome.
It's a matter of waiting for the crucial data being found. How long did it take us to pin point the source of other pandemics?
This stuff takes time.
Internet speculation only takes seconds.