If you fail to see the difference, I strongly suspect that you have never worked with or been on a horse that would not hesitate to literally kill itself in violent and awful ways rather than cooperate with a reasonable request. Not even in a blind panic or anything like that, I mean an animal who has self destructive fits where it truly does not seem to care if it lives or dies. It’s really not an experience that is at all similar to what one normally encounters in the course of training even difficult animals.
Even though I rode my rearing horse for years, I wouldn’t even come close to saying that I “fixed” him. As far as I know, there’s no way to install a sense of self-preservation in a horse that has none. He and I reached an understanding, I’m comfortable saying that I managed his problems successfully, we trail rode for years without a rearing incident, but he was never going to be fixed. That switch was always there, lying in wait. And I knew that if I made the wrong call he’d still go up and over. Or throw himself off the side of a cliff with me aboard. Or any number of self-destructive and dangerous behaviors.
He had another habit that was not as dangerous, but extremely disconcerting that I remember very clearly. Some of the trails we rode were steep in places, and had terraces in place to keep them from washing out. When Arlo (my horse) would go down those stairs, he would literally just walk forward, straight ahead, and fall until his hooves hit the ground. It would make my stomach lurch just like it would in an elevator that dropped too quickly. I have never sat on another horse that was so completely disinterested in his own safety.
It also bears mentioning that I was definitely young and dumb back when I was first training this horse. The best lesson I learned from him was that sometimes you just have to let things go. Some fights you can not win, some problems you can not fix.