It's not a crazy theory by any means, but, if it happened, then there's evidence. So, where is the evidence? Literally, where is there any actual evidence it happened?
Domain expert scientists on the lab leak hypothesis: https://thebulletin.org/2020/06/did-the-sars-cov-2-virus-ari...
The evidence is with the intelligence agencies of Western nations. Trump and Pompeo (Pompeo was sanctioned by China hours after new President took office) did not make up their "China Virus" as some racist dog whistle. They were informed.
The WHO, when pressured by the UK for China not sharing information, nor allowing access to a team for investigation, said: Now is not the time to point fingers. We need China cooperation for now. The UK replied that it then has to assume the worst possible and prepare for a pandemic. It did.
Actual tangible evidence is rare, but it is pretty damning that: China blocks Australian-led world-wide investigation into the origins of COVID -- re-sentencing Australian prisoners to death penalty and messing with trade relations to hurt Australia's economy. They'd do that for a natural zoonotic-base virus that was out of their control? Phone location records show containment procedures around Wuhan lab around October 2019. Former military analysts in Israel pose the lab leak hypothesis as plausible, betting their reputation on it.
It is not too fair to ask actual tangible evidence, if evidence could mean a hot war or severely strained relations during a pandemic where people need to work together. And what is your tangible evidence for the popular zoonotic hypothesis? Just some experts saying that zoonotic base is most likely when interviewed for a popular news outlet? The most likely hypothesis should be the easiest to find actual support for. Why not?
I think a lot of criticism on the drastic measures to contain a relatively low CFR virus would be dispelled if the general public knew what the decision-makers then knew: a strange novel virus which seems extremely adapted to infect humans, and shows more similarities to the lab viruses worked with in biowarfare, than with captured and documented cave bats. Similar to the "airborne COVID" -- first publicized by the head of the WHO -- we seem to be managing the factual information flow to avoid panic, geopolitics, and xenophobia. It is right now not important that the general public knows it is dealing with an engineered virus or lab leak. Or at least... other things are more important right now.
Example: https://www.bbc.com/news/science-environment-55998157