I'm not sure that "making it in a lab" is illegal. Haven't many countries engaged in gain-of-function research? Is that illegal? Under what law?

Also "lab leak hypothesis" in no way necessitates "making it in a lab" or gain-of-function. It could be that the virus was being researched in a lab and it leaked.

And it's not only a question of intent. It's also about proximity. There are thousands and thousands of intermediate steps between carelessness leading to a lab leak and a global pandemic. My concern is that by calling it murder, you have no way to explain how driving a car isn't murder due to global deaths from pollution.