Deformed horses need love too. They can't help it they don't live up to our performance expectations.
My own colt was born with a mildly deformed cannon bone. (If you can call any cannon bone deformity mild). I always said I would never get rid of him due to his leg. If he is too much for me to handle I guess I have to cross that bridge when I get to it. But I would never send him off to an uncertain future due to something he was born with.
Luckily his "problem" does not seem to effect him right now and my vet feels he will be fine as a trail horse. And even if he was not sound I would keep him anyway. The only hesitation in my mind is because we have been having some respect issues. But I think we are on the right track now.
Anyway, I am pretty faithful to my horses, so if a horse like that was born to me I would do my best to keep it. I think if people bring a horse into the world they owe the horse some kind of a decent life. If they can't provide that, the horse should be humanely euthanized or found a good home as a lawn ornament.
But deformed horses need love too.