Earlier quoted context omitted.
In software you would never do a postmortem without understanding the root cause of the incident. If this was caused by a lab leak, or even gain-of-function research, that seems like a pretty important detail.
But that's not what you would start with. If you have an incident and discover that your response plan was hilariously inadequate, you would prioritize making more robust response plans because even if you can prevent that exact incident from happening again, there will be other disasters.
Put it this way, if the cause of the worldwide pandemic was because it leaked from a lab then you should fix the lab.