Whatvare the arguments for gain of function research? Is there any reason to think the mutations gained as a virus adapts to mice with human lung tissue will resemble the ones it makes when it crosses in the wild? Or is it kind of like the old giant nuke plants, a way to peace-wash war tech?

Edit: Vouching for the reply wasn't enough to resurrect it. It was a claim with no support other than an appeal to authority, but that means you reply to it with a counter not bury it. It sidestepped the question of whether adapting an animal virus to humans has sufficient gain for the risk.