Earlier quoted context omitted.
Except that it’s not inactionable. If it happened once (accidentally, I’m presuming), it can happen again. It’s not like the Wuhan lab is the only source of such research. So it’s entirely legitimate to question the value of such research, especially if a leak could result in a global pandemic.
That doesn't answer the question about what the West is supposed to do to China should the lab-leak hypothesis be true.
The west, or society, should use this as evidence of basically not trusting information from the government of china, if it is contradicted by more neutral or western sources, in the future.
So, for example, if someone is talking to you personally, and they try to use evidence from that government, and you have other evidence from western sources that contradicts it, you should just laugh in their face. Call them a mean name and ridicule them.