This has been a rather interesting discussion to follow and it has been fascinating to read/learn from all of the different perspectives.
Though I didn’t grow up on a farm myself, most of my Dad’s side are farmers (including my grandparents), so we were raised with a, what I would call, practical, outlook on the life of livestock. I have lived in a very urban area for most of my life, but even as “city girl”, I’ve been to an abattoir a couple times. Most of those visits were as a child and I watched the humane and fast slaughter and processing of sheep (I don’t eat sheep personally).
I would just comment that the sheep I watched be slaughtered had a significantly less stressful experience than what most animals go through in a big slaughterhouse. If we had more freezer space and had the capacity to store entire (or half) carcasses, we would probably use an abattoir more regularly as our source for meat.