I live in a rural area with a number of farms, most of which are less than 500 acres I personally know many of the farmers and have worked on a few; being a farmer on this scale is a vocation and, believe me, they love their animals and take VERY good care of them.
When it comes to dispatching the animals, in the UK, there are very stringent regulations to ensure they’re killed as humanly, and with as little stress, as possible.
So these animals are protected from disease, wildlife and winter, which, is more than can be said for many people here; that sounds pretty ethical to me.