Example: https://www.bbc.com/news/science-environment-55998157
Yes. You are supposed to believe the administration of a president when they claim: The virus came from China. Whether deliberate or accidental, it likely originated in a laboratory. If you don't, I reckon you have bigger problems than a pandemic. If you can't trust your government on such critical matters, if you really believe the US government would stand for the secretary of State spreading lies, then you should probably flee to China and ask asylum there.
> Sorry, but that's just not good enough.
But experts saying: "Virus is likely zoonotic, but we have no idea" is good enough? Again, demanding others to proof that a teacup is orbiting Venus is reasonable. But not when you can't even show the existence of teacups or Venus yourself.
> Actual evidence in the zoonotic origin column greatly surpasses that in the lab leak column.
There is no actual evidence. Actual evidence of zoonotic origin would establish the transmission chain and identify patient 0. There is none. You have "Bats can be the original carrier". So your hypothesis could be true. It is circumstantial. Any actual evidence would instantly kill one of the hypothesis. So you share some responsibility there.
For an example of how to turn the BBC article into circumstantial evidence for a lab leak, is to study the franticness that went on with sequencing and publishing. Wuhan lab published the sequencing of bats captured in 2017 in 2020. It was complete PR management campaign, with scientists blaming "Mother Nature" not their research, information black-outs, and sharing of "secret" sequences years after the fact in support of zoonotic chain, while blocking any outside investigation into the origin which would support/not support the zoonotic origin.
Very similar things happened with hydrochloroquine. HCQ was known effective for SARS-1, and prelim research showed it also was effective for SARS-2 (less grave symptoms developed) in the middle of February. Just did not help when the patient was already severely sick, so was not a cure, as touted by trigger-happy Trump months later. But then all of HCQ was discredited as being useless snake oil, and responsible for killing Americans when they drank aquarium cleaner. It was a political hit job on science, to punish Trump playing lose and politics. None the wiser or the healthier.
Finally. When the virus was not yet a pandemic (but clearly on the way there), the right prepper movement started talking about masks, self-treatment in case of hospital crisis, and food and vitamins (vitamin D and selenium were chosen for their effects against other viruses) to keep immune system healthy. Meanwhile in the US, progressive politicians held mask-less photo opportunities at China Town restaurants to signal their support and that fear is unreasonable. Democrat politicians, former presidents, and public health officials were stating to not buy N95 masks for these were not effective and wearing them would signal you were ill. Then Trump went muh-freedom-america on masks, and the progressive-left opposition to not mask wearing grew overnight.
On all these flip-flops, the US held conflicting positions, and any science was an afterthought. I classify your objection to the official US position on lab leak as lies as part of this politics game. It makes you think of your entire government as a single "bad" figure, blatantly lying or skipping over their intelligence agencies and geopolitics experts, because their irrational hatred for China feels deserving of a big lie. Trump and Pompeo fabricating the lab leak hypothesis seems like a bigger story than the Trump-Ukraine scandal. If you have any actual evidence for that (or strong circumstantial evidence beyond Trump playing loose with facts) then it is your duty to inform the American public of that radical conspiracy.