No need to be snarky, it was a fair question. What new evidence has emerged to suggest that it "seems likely"? I haven't read that many articles but the ones I have read are short on details why the thinking on the virus origin has changed. Has someone found out something that we didn't know about before?
But in general I agree with you about the utter stupidity of producing dangerous viruses in labs. The number of leaks of dangerous substances from top security labs is just frigging scary. As an example, the anthrax used in those mailings in the weeks/months after 9/11 came out of a US Army high security lab. If it can get out of a place like that....
That nearly 4 hour podcast on Sam Harris's podcast channel from 1 or 2 weeks ago that I gave the link to above discussed the insanity of creating new viruses at great length.
(Sometimes it seems like human history might end up being one long sad tail of arrogant stupidity on the part of empires who accumulated too much power and made their leaders drunk with it.)
Asking what proof is there that it occurred naturally is also a fair question. The fact is the Chinese have hidden all evidence from WHO and other investigators after hiding that there was even a virus release for something like 5 weeks at least. Frankly, I don't even believe WHO. They seem to be in bed with China. They spoent 5 pages in their reports about the lab and hundreds about animal origination although I don't believe there are any animals discovered with the virus.
But there are researchers who had the virus. The new evidence revealed a couple of days ago in the WSJ that has even former lab deniers concerned is that it was just reported that there were three researchers from the lab that got sick in Nov or December of 2019 just before the outbreak.
My biggest flag was something I read a few weeks ago. Virus specialists said that the variant that has been spreading in humans had too many "human" markers that only develop after a number of adaptations. These adaptations can occur in two ways. One is they have been spreading in humans for a period of time and adapted naturally. Second is that the adaptation was developed and processed in a lab. Problem is if it occurred naturally, then we would have seen the disease at an earlier stage with more animal markers which would have indicated animal originations. Since we never saw earlier variants with those markers, that leaves adaptations that occurred by man in a lab. It was the later variant that got out of a lab.
Add to that the coincidence that the lab was ten miles from the food market and in Wuhan where it was discovered and the indication that no animal has these virus pathogens, and it's a good likelihood that it developed in the lab. Since I'm a betting man, I know where I would put my bet.