The timing on the leaked federal assessment that Covid 19 originated from a Wuhan China research lab is such that it supports Biden Administration efforts to develop hostility toward China. The Biden administration and Democrat lawyers tend to use every available means to act against their political opponents. Having used up most of its non-nuclear options against Russia it has ramped up its actions toward China. Though Democrats excoriated the Trump administration for suggesting that the Chines lab was the most likely source of the leak it has changed its tune when the Wuhan lab story would support its present objectives.
It is of course possible that Covid 19 did originate in the Wuhan biological research facility, and most likely did, yet nothing has changed since Feb or March 2020 to prove that. What has changed is the Biden administration full scale support for the Ukraine war against Russian forces in the midst of their reconquista of lost Ukrainian real estate. The administration is concerned that China may supply weapons to Russia as it does to Ukraine and would like to form a better world opinion against China with I would think, the hope that China will feel hurt by various nations believing it would allow Covid 19 to escape from one of its many biological research facilities.
Of course millions have perished from Covid 19 and a million more perhaps were injured or killed in Ukraine. Human beings being what they are it was likely that some time some lab someplace would have a serious biological accident. If computers with A.I. handled the deadly pathogens they too would probably have a leaky day or wrong though iterations that led it to believe the leak was the right thing to do.
Politicians find reasons to escalate wars as the right thing to do too- even when they put little work into thinking of alternatives lines of development than protracted war. If you build it they will come applies to other things than building sports stadiums. It applies to biological research facilities and nuclear weapons programs as well. It is then that the possibility of something going wrong some day increase in probability.