Well, it could be that. No doubt. Terrorists had not flown planes into buildings before 9/11.
I don’t think one has to put on a tin-foil hat to think it could be caused by terrorists. It is a possibility.
Flu starts in Asia because there’s a cultural farm animal DNA mixing that we don’t have here or in Mexico. Also seasonal flu follows patterns... it doesn’t start in the summer. And natural flu doesn’t have time to devolve by the time it gets to us... if it did - we’d never experience it. That said, like you - I have doubts. Just something to consider.