I haven't read the full thread, but have seen the same old selfish, lazy and ignorant views from meat eaters.
I have nothing whatever against vegetarians, I could easily be one. It is the breath taking arrogance of this statement that irritates me and makes me lose all patience! I grew up in the countryside-I was close to the food sources. I buy my food from a farm shop, I know how it lived and I know that it wwas killed locally and humanely. My DCs have always seen lambs in the field as we approach and know that they are going to end up in the cabinet inside. I can't remember a time that I didn't know. Do you really want a world without a single farm animal-except in a museum farm park?
What will happen to the Welsh hillsides? Or if the sheep are just kept for wool until the die of old age what is going to happen to the bodies, are we going to have giant burial sites until we run out of space or huge incinerators polluting the atmosphere? Who will pay to get rid of the bodies? Will there be no more wool as farmers find it uneconomical?
Human beings are trying to get the right to die when they choose and yet the poor cows will have to linger in an old age with ailments that make them miserable.
I would love someone who arrogantly thinks they are right for everyone to explain to me how dogs and cats are to be fed. 
Are the best cuts of meat to go into tins? Who can afford to buy prime steak for their dog? If you are to say that animals go into tins when they die of old age-who is going to keep the animal-food and vets bills will mean they sell at a loss. Perhaps we stick to dead horses? Would there be enough dead horses? Could someone enlighten me on this one?
Do you drink milk, eat cheese Pia? If so I doubt whether you have the slightest idea how it is produced, or you would know that your statement was particularly hypocritical. (apologies if you are a vegan).
For those who think that killing an animal for food is cruel and have a lovely Marie Antointette idea of milkmaids-the facts on milk production are here. Have any of you ever heard a cow and a calf calling to each other all through the night? It is pitiful. Have you thought where the male calves go? Sold at one day old for veal production.
If you have good reasons for being a vegetarian that is fine- but there is no reason to convert the world because it suits you. If you are holding a sentimental view of animals at least get the facts and give up dairy products!
I think that DC can be brought up quite happily as vegetarians, I have nothing against it, as long as the parent explains 'that is what I believe and when you are old enough you can choose for yourself' And not brain wash them in the meantime.