Maybe because they know what meat and dairy ultimately does to the body. That doesn't make it political. I have been on a whole food, vegan diet for over 5 years, and am the better off for it. I don't put dietary cholesterol in my body. The body makes all the cholesterol it needs. You may have lost weight, but you need to look out for heart disease and cancer. If you want political, research how the beef industry literally harasses any doctor who promotes a plant based diet.
Veganism is not unhealthy at all. That is an uninformed opinion based on your preconceived notions and your own wishful thinking because you WANT to believe it.
Giving up animal product cured me of allergies and controls my weight. Nothing political about it. Do some research outside of your comfort zone.
Dairy perhaps, since most people are not adapted to process dairy as adults, but you body is designed to digest meat.
Scouts Out! Cavalry Ho!