I am going to wade in here. Carl Hester is a very well renowned horse man, and known personally to a friend of mine and the wife. He looks after his horses extremely well. The bond between horse and rider is one of trust and respect, I do not understand the comments about RSPCA. It also takes a great deal of effort, time and skill to train the horse to do everything that is required, so effort is required on behalf of the horse and the rider. I am not going to get into the olympic sport thing, as that is subjective, but if these riders were not good custodians of there horses, they would not be as good as they are.
I am not generally a horsey person, but my wife has a horse, and she takes a great deal of care and attention (and my money) looking after it.