Earlier quoted context omitted.
Do you really need to rain on everyone's parade? Some people like meat. Deal with it.
The animals don't like it. The environment does not like it. Eating animals is not a "live and let live" situation because you are denying others the right to live.
Also, rational self-preservation doesn't work because it's not a freight train about to run them over and most people don't make decisions rationally. There are plenty of existential risks involved in meat ag:
1. Pandemic evolution through a combination of antibiotic resistances (to speed meat production), wildlife-domestic animal interactions, animal crowding (Petri dish like dorm overcrowding spreading meningococcal meningitis), and human-animal interactions.
2. Climate change - 12% of anthropogenic GHGs and growing. Already at 417 ppm CO2 and climbing.
3. Irreparable rainforest loses due to clear-cutting for CAFOs and feed grain farms affecting the local climate of other equatorial ecosystems.
Accelerating intensity of storms, variability of weather, and rising sea levels will lead to famines, resource wars, and retrofitting vs. relocation of major coastal cities. But because something hasn't happened yet, it's "crying wolf."
They will bicker, complain, take potshots, and rationalize kicking-and-screaming until told they can't have it anymore because they're addicts. The sooner there are sustainable alternatives, widespread lifestyle changes, and externality luxury taxes, the better.