Western countries (and particularly the US) have been conducting similar research for years. Despite imposing bans and other restrictions on their own soil, they may want the option to continue doing this in less regulated places, e.g. China. In the same way and for the same reasons that our manufacturers have outsourced hazardous production processes to less regulated countries. Personally I think it needs to be banned everywhere, urgently, and an inspection regime imposed.

The US may also have been complicit in this particular experiment. There was a lot of collaboration with Chinese researchers working in US labs and the US sponsoring the WIV, etc.