Honestly, I don't really mind eating horse meat, or that I have eaten horse meat before. In fact, I've tried horse meat and, what seemed to be, beef at the same time and I actually liked the horse meat better, so I'm looking out for it.
All I care about is that they didn't tell me it was horse meat, that's just plain wrong since some people don't want to eat horse meat, and that's their problem and their concern, but that doesn't mean you should lie to them and make them eat it anyways. I do think that most people are overreacting, because I don't really get the difference between knowing a cow died or knowing a horse died.
So I guess it's all just a matter of principal for me, I don't care they lied and I don't care I've eaten horse meat. I do feel sorry for the people that did eat it and didn't want to, but hey, if you love animals so much, become a vegetarian.