Just to add, horse sales are no different than any other livestock sale as far as you go to the one with the reputation for what you want to buy. Some sales are known for killer horses and others are known for saddle horses. You have to know your sales and go to the one that fits what you are looking for or selling.
Honestly I think the horse meat industry needs to be treated like the beef industry. Under law, horses are still considered livestock not house pets. If we are going to do it go all the way like what we do with beef- feed lots, drug withdrawl requirements, meat grading etc.
In my opinion, not using the meat is a lot like cutting down a tree and not using the wood.