If you take the other hypotheses, it goes like this: some bat coronavirus -> jumps to an unnamed animal -> jumps to a human. There is an unknown entity in this equation, which is the third party animal. This is necessary for the theory to work.
If you make me chose between a theory that has all the elements and one that might or might not find a mythical animal in the future...I think Occam's razor favors the one with all known elements. Otherwise, ad-absurdum, you can win any argument stating it's Occam's razor: you just introduce a single magic black box which can substitute any number of entities.
I am not doing this to blame China. I blame China for the opacity of the response, which at times seemed like they didn't care what happens with everyone else. I can blame China regardless of how this virus appeared. I also blame our top scientists, which covered their asses instead of coming out with everything they know and work for the greater good.
What I do want is better bio-labs safety protocols, something that can be monitor by third party inspectors, say from UN, just like we have for nuclear facilities. Lab leaks happen, it's not a Chinese thing: https://en.wikipedia.org/wiki/List_of_laboratory_biosecurity...