If any part of the gut, bladder or gall bladder is damaged while the animal is alive, the contents mix with the blood and are carried throughout the meat. It ruins the taste of the meat. We have been serious hunters for a lifetime and we eat what we hunt. So, we are really picky how game animals are shot and how the meat is handled. We have never hunted for the heck of it.
Back to the original subject (sorry), there are always going to be unwanted horses. Until we have very well-managed processing plants here in the US, a quick bullet far better than being neglected, starved to death or being shipped thousands of miles to Mexico or Canada. Feed is too high to keep endlessly feeding horses that have no good use or it is for most people.