Those are beautiful animals. I do understand how people can become attached to their horses.
Are you willing to pay for all of the euthanasia of all horses that don't have owners who feel the same way about their animals? I'm not. I don't want them to starve either. I've raised cattle, eaten 'Easter' a steer I had to help deliver because he was breach. I've raised pigs and can tell you that 'Petunia' tasted better than 'J.R.' I'm not sure I could order horse meat, and I doubt I could have slaugthered any of those I trained or watched take those first stumbling clumsy steps.
I do love the beasts, but they are beasts. 'J.R.' was a pretty personable hog, he liked to carry feed buckets to me if I left them laying about. 'Easter'... well I did smile when I bit into that juicy T-bone. I guess he got all the meanness out of him because the meat was smooth and tasty.
I am glad you feel something for it... how awful it would be to feel nothing, no compassion for even our food animals.
Are you willing to pay for all of the euthanasia of all horses that don't have owners who feel the same way about their animals?
Euthanasia costs less than a set of my horse's shoes. There are responsibilities that come with horse ownership, and slaughter or starvation are not your only choices. We don't send our old dogs to slaughter either. I'd argue that it is long past that horses were the valued but not really loved work animals we needed to survive, they are now a luxury, a pet, a hobby. Some hobbies have expenses.
I'm not in any position to impose my will on the world, but I can try to change the minds of those horsemen I talk to.
I've also raised and fed steers for slaughter, it's not really the same thing now is it? Steers being grained get so pushy I feel I could shoot them myself ;~D