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I feel bad for the horses described in the article. However I have a hard time respecting the opinion of people who get all up in arms about mistreating those animal species which are commonly kept as pets, such as horses, dogs, cats, or bunnies; while mostly ignoring the plight of other animals, such as pigs, cows, sheep, or chickens, which aren't treated any better than the horses described in this article. I'm quite sure the slaughterhouses being criticized in the article don't treat other animals any better. I'm certainly not going to buy into the idea that someone who would slaughter a horse for food is any worse a person than someone who would slaughter a pig. Either slaughtering animals for food is bad, or it's not, and either treating animals humanely is good, or it's not.
This quote from the article was especially richly ironic:
It's a betrayal to put [horses] on a cattle truck and send them to slaughter.
She's condemning putting horses on a cattle truck for slaughter. Did she even realize as she was saying this that it might make sense to also be concerned about the cattle that the truck was meant for? What's special about horses, other than that people in this country tend to keep them as pets and work with them one on one.