There is some interesting information in amongst all the loaded language, straw men, naturalistic fallacies, and failure to think at the margin, but that piece largely comes off as a hack job, where the author started with their bottom line, and worked up.
My favourite parts:
Vegetarianism is unnatural. This is not a modern finding. The Bible gives us evidence of this, and clues that vegetarianism was not regarded with favour. In Genesis , Chapter Four, Eve bears Cain and Abel. 'And Abel was a keeper of sheep, but Cain was a tiller of the ground.' That 'but' in the middle of the sentence is the first clue to disapproval. This disapproval is confirmed by verses three to five. Abel and Cain bring offerings to God: Abel of his sheep and Cain, the fruits of the ground. God, we are told, had respect for Abel's carnivorous offering, but He had no respect for Cain's vegetarian one. [To be fair, the next paragraph then admits that this is not really evidence of anything; which raises the question of why it was included at all.]
Have you noticed the increasing numbers of occasions when small groups of very militant people demonstrate against all sorts of things: animal experiments, butchers' shops, new roads, footpaths, nuclear power stations, civil rights, homosexuals' rights or anybody else's rights. The odds are that the majority are vegetarians... Meat is the best source of several nutrients. When our bodies are deficient in these, we become irritable and aggressive. ...This is why strict vegetarians tend to be so vociferous. It is a trait that was recognised long ago; it was, after all, the vegetarian Cain who killed the carnivorous Abel, not the other way round. [I somehow missed the all the vegetarians demonstrating against people's civil rights, but whatever.]
Vegetarianism — a form of child abuse...
There are certainly tensions between the various goals that many vegetarians have (both between health, animal welfare and environmental goals, and e.g. between different sets of environmental concerns). Many of these tensions aren't always given the attention they deserve. But this article doesn't really advance our understanding of them much.
OK, like I said, I didn't read the entire thing. I'm gonna keep on eating meat though, because it's tasty and I'm not sure killing animals is that bad. The lives of animals are certainly worth less than human lives, aren't they?
I have noticed that among philosophers, vegetarianism of one form or another is quite common. In fact, I became a vegetarian (technically a pescetarian) myself partly out of respect for an undergraduate philosophy professor. I am interested in finding out if there is a similar disproportion in the Less Wrong community.
I didn't request that this go into Yvain's survey because I want more information than just what animal products you do or don't eat; I'd also like to see nuances of the reasons behind your diet. There are a lot more shades than carnivore/vegetarian/vegan - if you want to be a vegetarian but are allergic to soy and gluten, that's a compelling reason to diversify protein sources, for instance. I'd also like to hear about if you avoid any plant foods (if you think they're farmed in a way that's environmentally destructive or that hurts people or if you have warm fuzzy feelings for plants, maybe). Here are some questions that come to mind: