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by ip26 2585 days ago
IMO the answer is pretty simple; they were vital to building modern society, and as a result we're culturally accustomed to their use.

It probably helps that many (though by no stretch all) horses are very well taken care of and have a job to do. Show animals on the other hand (horse or dolphin) have a long track record of abuse, exploitation, neglect, and boredom.