“An alternative scenario is that (1) the flu strain was man made...”
Umm.... No, choice A does not follow, any more than Martians produced the virus. There is no proof for it, nor is there factual support for such a statement.
On the other hand, it’s a crackerjack theory for sure. . Though I think the this particular flu virus may be kinda’ lame, as pandemic virii go. I’ll bet/hope it’s not up to the 1918 variety. If you haven’t read it yet, there’s a couple of books (probably available at your library), “Flu : the story of the great influenza pandemic of 1918 and the search for the virus that caused it” and “America’s forgotten pandemic : the influenza of 1918”. They’re both good reads. I guess we’ll see how nasty this one is fairly soon.
Now that's a crackerjack theory, not yours I understand, but a real crackerjack theory nonetheless. Nothing can be ruled out in these most interesting times ;)