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Bilbo caught the same thing I did: "It's a betrayal to put [horses] on a cattle truck and send them to slaughter." is full of ridiculous, rich irony, reeking of speciesism. Cattle are different from horses... why? Pigs? Crocodiles? Chickens? Turkeys? Anything slaughtered for human consumption? I'd argue that if we're going to allow one, we might as well allow all of them. Heck, we might as well allow the consumption of human beings as well (there's my irony for you, with such a modest proposal).
You get to choose between one or the other: eating meat or not. If you can justify one and not the other, you better have good reasons. I've been heading more and more towards the vegan option myself.
Yet, horse meat does taste good, especially prepared in a nice Italian fashion with some roasted vegetables on the side.