One reason why you can't eat horse meat is that some states ban it outright. The larger reason is that Congress passed an amendment banning inspections in horse slaughter plants, preventing them from opening. These facts are well documented in the media, as this Jan. 17, 2014 NPR article exemplifies.
A bipartisan majority supported this amendment because the drugs horses routinely take are banned in food animals. Furthermore, there is no proper system in place to track these drugs, making it impossible to keep tainted horse meat out of the food chain. As a reporter, Enders should have known these facts. And reported them.
Enders' suggestion that wild horses would be suitable alternatives is equally misinformed. For one thing, wild horses in BLM holding facilities are wormed and vaccinated (therefore not free of drugs banned in meat animals). For another, Congress prohibits the slaughter of wild horses. As a reporter, Enders should have known that, too.
Why did she not? Simple: industry, whom she relied on for her reporting, doesn't offer this information. The only place you'll learn about the intricacies of horse slaughter (and wild horse round-ups) is from advocacy groups: the very people Enders and Philipps gave one word of text to for every eleven it handed to ranchers and the BLM.