I'd argue should be doing more to ensure lab biohazard safety regardless of the origin of COVID-19, which is one reason I don't think knowing the answer has a lot of practical significance.
If you'd like to see greater regulation of biological research, then I'm pretty sure strong evidence that it killed millions of people would help with political support for that? So I'm not sure why we wouldn't look, especially when many obvious paths (e.g. subpoenas for all data potentially containing early viral genomes as contamination, like from Illumina's cloud services) remain unexplored.
I think practically it would be used to generate hostile sentiment between countries and wouldn’t drive good regulations. But maybe I’m just a pessimist!
Hostile sentiment between which countries? The WIV was on Chinese soil, but received American funds and had many American collaborators; so I don't think either country is in a great position to blame the other. On the other hand that gives China and the USA a shared interest in discouraging investigation of the cause, as seems to have occurred.
