I don't think that it is quite as settled as you put it regarding the health evaluation of veganism. I do believe that the healthiest diet includes at least some fish, due to certain omega-3 fatty acids.
The [SIZE=-1]American Dietetic Association disagree - "[/SIZE]"well-planned vegan and other types of vegetarian diets are appropriate for all stages of the life cycle, including during pregnancy, lactation, infancy, childhood, and adolescence."
I also dispute your claim that it is just as easy to be a vegan as an omnivore. Not so. It is much easier to have a balanced diet that includes some meat and dairy. It is also easier if you don't have to worry about any animal products in foods that are mostly vegetarian - or at least don't have meat.
You need to put a little
thought into what you eat, certainly, but it isn't
difficult. The vegan products are right there on the shelf next to the non-vegan ones (in supermarkets in developed countries).
Further, the way you phrase your question assumes that one should not eat meat or dairy. It starts from a position that to do so is somehow wrong, and therefore demands a good enough reason to do it. I disagree with that stance.
Fair enough. It doesn't assume that one should not eat meat or dairy, though. It takes "diet" as a blank canvas and asks for coherent and convincing reasons to pick one over another. I ate meat because I always had done. I had never
thought critically about what I ate. When I did, and I learnt that veganism is at least as healthy, that there exist vegan substitutes for many, many things that are pretty much indistinguishable from their animal based counterparts, that veganism is less destructive to the environment, that veganism doesn't involve the suffering of sentient beings for no good reason (if I can survive as well without eating meat, why is the suffering justified?).
I didn't start from the position that eating meat was wrong, at all. If it's right, I'd like to hear a reason. Rolfe's discussion of land use is an interesting one, but I don't think it's watertight. Everyone else suggests laziness and "taste" as reasons enough to justify the benefits of veganism outlined above. As a critical thinker, that's not enough for me.
You may see certain advantages to a vegan lifestyle that outweigh the disadvantages - which certainly exist, no matter what you may claim - and that is fine. I respect that choice. But your persistent stance on this thread has been to imply that eating meat or dairy is for "woos". Omnivores just apply a different cost/benefit analysis than you do.
As I said, I'm not evangelical and there is no reason to be dogmatic about veganism. No doubt locally produced meat and dairy are "better" than industrialised veganism. But that's not the world I live in - I live in an urban environment, and shop at supermarkets for the most part. For me, it doesn't make rational sense to eat meat.
I don't judge people who have decided otherwise, as long as they've thought about it and actually done the "cost/benefit analysis" you talk about. I simply don't think most omnivores
have ever done this. Omnivorism is just a habit, an indoctrination if you will, for most people - it certainly was for me.
All I'm asking for is that people critically think about their diets in the way they critically think about other areas of their lives. If they come to the conclusion that's different to mine, then so be it.