This lifted ban is a good thing, and a bad thing. I don't agree with slaughter at all, its inhumane, and wrong. But it is nice that horses now don't have to be transported half way across the country to arrive at their death. As BeauSeant said, I think that instead of making it legal to kill horses, they need to find a way to stop random, backyard breeding. If it wasn't for the total over population of horses we wouldn't really need too many slaughter houses. Instead of stepping around the problem, they need to step onto the problem, and fix it. They aren't facing the problem.
The lifted ban is a sad thing, but the right thing. At least horses now don't have to travel 1000's of miles to be killed.