What in that blog made you write him off? I also clicked through and found very thoughtful writing on the topic, though I still disagree with their position as I understand it.
Animal rights nuttery. It is the product of an irrational mind, everything he says and thinks is suspect. While he might be accidentally correct on other topics, now I have to vet every single point and turn of logic on my own... and if I have to do that, I might as well do it without his input. Nor am I particularly curious if we did arrive at the same conclusion.
The same impulses that make people search for religions (and when they can find none to their liking, invent them) is what leads to that particular brain disease. I have no need of the religion. I mean, it's already a dietary code, it just needs a prophet and it's complete. Animals are food.