Originally Posted by Makoda
Personally I'd put it down. Too many good horses to mess with ones like this. Not just saying it either I have worked with them. Horses like this need someone who is very experienced to handle them, but anyone with experience knows that a horse like this isn't worth the time.
It will just hurt somebody or something
I worked one like this for a lady. Got the horse doing really well. She sold it and it happened again later on, ever since then I felt like my work with that horse just led to someone else getting hurt. Sure I handled it fine but then people thought I had changed it and got too relaxed around it and it happened again. So I say kill it before it kills someone else. Those horses do have a purpose in life, they make good dog food.
I am not trying to make this sound rude or anything, but there are people out there that would do anything to save a horse. Even if it means having a dangerous animal, they will still try and fix it.
Many people I know and many people I don't know, have saved a horse like this from being put down for this specific reason, and have fixed them, they made the horse trustworthy, reliable, rideable and safe for everybody.
There is more then one option for this situation, killing it is more then likely not one of them.