I happen to think Militant Vegans should be eaten or composted but even I will agree that your first sentence is broadly correct. Industrialized agriculture and CAFO operations are to blame for this so you can generally say that consuming animal products is to blame.

Your second point is highly speculative and not based on any factual evidence. The speculated worst case scenario seems to be maybe 20x COVID-19, or 140 million worldwide.

As a vegan, I should think you’d celebrate even that high rate of attrition. It would mean, overall, far fewer delicious animals being consumed.