I guess if you feel that being murdered for food, by people who don't actually need that food for optimal health, is not the height of cruelty, then by your lights you are right. My question is always, if you were taken from your mother at birth, raised in filthy overcrowded conditions, and then killed for food as soon as you reached optimal growth (by creatures who didn't actually need to eat you for optimal health, but merely liked the flavor) would you feel you had been treated well? A quick and painless death hardly makes killing humane.
I'm not going to convince anyone to stop eating meat. But I will say that if you do eat meat, you've got no moral grounds to criticize people who really had no alternative. The damage done to the environment by the commercial meat industry is incontrovertible. The inefficiency of commercial meat production is incontrovertible. And although there are people here who will dispute it, I say that eating the amount of meat that the average American eats, is far less healthy than a vegetarian diet. If you eat meat, you do it because you like it. Those sailors ate tortoise because in the absence of fresh vegetables at sea, they needed it. For a meat-eater within reach of a grocery store in America to criticize those sailors is the height of hypocrisy.
Environmentally it's pretty bad. Though there are also major differences between different types of meat. Cow/beef being to my memory the worst, but looking it up now apparently lamb is the worst, in particular on this figure
. Pork being far better, chicken far better still.
And yes, the amount of meat people eat matters, same as how many children they have. Or pets, many of which have to have meat. But people don't need to have children or pets.
To your question, as I said the treatment matters, including how much space they have. I see major difference between fur produced on animals in tiny cages, and wool from sheep in roomy fields. I might be biased on the sheep, because I can see them here free to roam half of the year, and I don't see how they're treated in winter (or when they're in the mountains, unless I happen to hike through, but I figure they have no worse time there). If I was going to be raised for food, and somehow also knew that, I'd prefer having a higher quality of life to not. And whatever the reason for my death, I'd prefer it to be quick and painless. But I'd probably instigate a rebellion if I thought I could escape and have a better life elsewhere.