I believe I sent a horse to slaughter.
My horses are pets to me, I love them dearly - but I made a terrible error a few years ago and bought one that must have been drugged. It took several weeks for the true personality to show, however when it did, the horse was completely dangerous. She could not be led without rearing (full rear, full height).
Under saddle it was worse, she would turn into a bucking bronco ride. Rear, buck, rear, rear, buck, twist. She was terrible. So I rode her in the walk only for about a year, that didn't help. I took her back to basics and restarted her, that didn't work. She would charge at me in the round pen, and it was not because I was not assertive enough. I had 3 different trainers work with her, nothing helped.
I owned her for 2 years, spent a fortune on her and a lot of my own time trying to get her right. Myself and three trainers were not able to. She was just dangerous. I did not want to put her in an auction, she could not have been ridden through it or if she was, that would have guaranteed her slaughter.
So I listed her for sale for $100 negotiable. I listed all of her problems, was completely honest. I thought the $100 price would put off meat men. After four months, I had no interest and had spent more than $1k on board. So I listed her for free.
A pleasant couple came out to see her with a trailer. I was completely upfront about her behavior, they were unconcerned and claimed they had trained many horses. They saw her antics when we tried to load her, even with Ace she was rearing like crazy, they were still unconcerned and we loaded her with a chain through her mouth after about an hour of trying everything else.
It just doesn't make sense to me that she did not go for meat, why on earth would they want her. However they said the right things, so I felt it was worth a chance.
I am not against horse slaughter, I would not want my horses to go to it though. There was a chance they were telling the truth, and I thought it was worth taking that chance.