It's crazy to see people denying that (meat) factory farming is a problem. You'd expect most of the public of this website to be rationalists in one way or another. Of course factory farming is an aggravating factor for the spread of diseases. Of course we can thrive with less meat consumption or none. How is that even a question?
Those words require “as proven by” and then the sentence that follows.
The claims you make are so trivial as to almost be tautological. You make no quantitive claims except “none” for meat consumption. The most extreme possible position.
Rationalists put forward measured testable arguments that can be defeated by fair reason. Rationalists don’t frame the arguments for what they oppose in purely negative terms and what they support in purely positive terms.
Factory farming has had massive benefits to the health and well-being of humans on the planet. It is undeniably cruel. No meat consumption for many would lead to mental and physical health issues for many. It would also end some of humanity’s cruelest practices.