Additionally:
1. There wasn't a consensus, some scientists disagreed
2. A natural virus can leak from a lab
Also, a reminder that biosecurity incidents are common, there were about 17 in the last decade [0]. Just (natural) SARS-CoV-1 leaked from the lab 4 times [1].
[0]: https://en.wikipedia.org/wiki/List_of_laboratory_biosecurity...
[1]: https://en.wikipedia.org/wiki/Severe_acute_respiratory_syndr...