Theory 1 - Natural Origin (General)
One thing that has come up in research - the 'conspiracy theorists' use measured language to amass details backed by references - the top experts favour abuse and/or meaningless generalizations.
The conspiracy theorists emphasize that investigating a lab origin is not a binary thing - investigate everything - the world's leading experts emphasize that it is a binary thing: we're gonna investigate this - therefore we can't investigate that - "using logic and reason".