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The animal welfare people in this article want to 'humanely euthanize' these animals. However, if slaughter can be regulated by the US government, rather than turning away as another country lets anything go in their slaughter, then isn't that better? Yes, people eat horse meat, and slaughtering horses for meat IS ethical if we can regulate the slaughter.
Problem is (and I realize this), it appears we don't always effectively regulate the humane slaughter of animals we're generally okay with eating (see: downed cows, the PETA film on chicken slaughter). But, we're never going to 100% NOT eat meat. Overall, it's important to treat all humans AND animals humanely...I wish we could do so all of the time...