I disagree entirely with all your claims including your original. People don't eat vegan because it's healthier, they do it because we treat animals like shit and are killing the planet.
Cattle are the No. 1 agricultural source of greenhouse gases worldwide. Source: https://www.ucdavis.edu/food/news/making-cattle-more-sustainable
Beef production cause greenhouse gas emissions through the agricultural production process and through land-use change. Source: https://www.wri.org/insights/6-pressing-questions-about-beef-and-climate-change-answered
Unsustainable dairy farming and feed production can lead to the loss of ecologically important areas, such as prairies, wetlands, and forests. Source: https://www.worldwildlife.org/industries/dairy
I won't get into how inhumane the slaughter of animals is but the vast majority of meat bought at your grocery store or chain restaurant was killed in a cruel way. I used to live smack dab in the middle of 3 slaughterhouses and that shit was like a david cronenberg film.
Not to mention the water pollution from the slaughterhouses. Slaughterhouses and animal processing facilities that produce beef, chicken, turkey and other animal products are major water polluters. Source: https://frontiergroup.org/blogs/blog/fg/map-us-slaughterhouses-shows-watershed-level-pollution
Less vegan source: https://www.theguardian.com/environment/2019/dec/18/epa-sued-weak-standards-allow-slaughterhouses-pollute-waterways-meat-processing
Even more: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8694297/
I eat certain types of meat but let's not kid ourselves into thinking any of it is ethical. Propaganda, all of it.