In 2012, Obama signed an Appropriations Bill that would once again pave the way for slaughterhouses to operate in the United States again. Not withstanding the enormous environmental, legal and other concerns that a slaughterhouse brings to a town, the suffering of the horses who are sent to these plants is astronomical. They are sometimes put into trailers and left for days without water, then half-crazed, they are violently prodded into the slaughterhouse, where they are supposed to be killed by a captive bolt. Unfortunately, the horses are so scared that these bolts sometimes go into the horses’ eyes and the horse is struck again and again until stunned. It is not uncommon for a horse not to be killed by the captive bolt, but only stunned, so that they are actually alive while being vivisected.
Considering how horses are treated to the kill pens and how they are killed, here is no possible way that slaughter can ever be considered humane euthanasia.