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Nothing wasted. Efficiency to use them well in life and then use them well in death. We eat other animals as well. Your arguement seems more pro-vegan than anti-meat. To each her own I say; if you don't like it, avoid anything that may have horse in it. Dictating to the rest of us only makes you a dictator.
But if you really wish to try to make a difference then I suggest finding ways to convince legislators to tax the process and products to death. At some point other cheaper alternatives will sway demand away from equine products. This would have to happen across North America so be prepared to take your fight out of country.