Working out the initial cause of this Covid outbreak is far far far less important/actionable than working out what we should do differently when (not if) another virus starts spreading. This concept should be familiar to those in tech already: https://codeascraft.com/2012/05/22/blameless-postmortems/
Unless the release was due to gross negligence --like an outage is due to really bad decisions by someone. In those cases blamelessness is not productive and conducive to more mishaps,
But it keeps happening and maybe labs working with such viruses need much more careful procedures or shouldn’t perform risky gain of function research for example.