Kurzgesagt is one of the most popular YouTube channels, with over 23.6 million subscribers, and individual videos often getting millions of views. The videos tend to be on the topic of science, philosophy, culture - sometimes overlapping with Effective Altruism themes.
Their most recent video covers factory farming, focussing on the economic reasons why conditions on factory farms exist and what consumers of meat can do to make better choices.
Perhaps there are many in EA. My prior guess would be that many mainstream vegans feel disgust towards animal flesh itself. I know anecdotally that’s how I felt. Motivated as much by considerations of the sacred and the profane and sentiment as anything else. Already empathetic as a person, I was therefore prone to reactions like that.
This is on top of the marketing nightmare of getting people to accept “unnatural, lab-grown meat.” It reminds me of anti-nuclear environmentalist campaigners. And conservationists, motivated by a pristine wilderness that never existed. Sometimes, it is not a rational thing. Emotions and symbols drive things.