There are several contradictions in your article.  Here are a couple.  

"And it is wasteful, unlike slaughtering or rendering, and thus disrespectful to the animal." There is nothing respectful about horse slaughter.  

"People eat horse meat in Canada, Mexico, Europe, and Asia. Our cultural taboos forbid it, but food taboos are not moral principles. They are arbitrary cultural norms."  You go right ahead and eat that horse meat filled with carcinogenic chemicals.  Have a ball with that.  One of our "arbitrary cultural norms" here in the U.S. is that we like our meat clean!  

Numbers can be construed and used any way that the writer likes.  But we will argue that horse slaughter is inhumane and there is no room for it here or anywhere else, for that matter.  We will continue to look for the best practices to use to help our domestic and wild horse populations.  Maybe we haven't found the best way yet, but if we all worked together, we might just find a better way.  #BanHorseSlaughter