As much as I want to disagree with it; the fact of the matter is that it happens. And its heartbreaking and it is brutal. And yes, it makes people question their support of the sport. Seeing it in person or on video replay should make every horse-loving person question their morals.
And while I agree the breakdowns will never 100% be removed from the racing scene; there are many areas of the sport that need improvement to remove factors as potential causes. I think work is being done everyday to improve this but I also think there are other areas that do not get hardly enough focus.