I'm not saying you should calculate it like P(10 000 tails coin flip) * P(1 000 000 tails coin flip). That can be done numerically. I'm saying that based on everything I've read, the highest probability hypothesis according to my own evaluation is the unintentional lab leak. To me, that's as uncontroversial as it gets. Human error happens _all the time_. Arguing against the lab leak, knowing what we know about China's refusal to allow an actual thorough scientific investigation into it, seems quite a bit more controversial to me.
Labs burn down, medical errors happen, bridges collapse, whatever. That's just reality.