A sensible question was asked, why do people enter horses in the Grand National? No, it is not generally for the prize money, which is not the highest, but for the thrill. How can you explain the thrill to people who are not thrill seekers or competitive? Riders feel the thrill but horses also feel the thrill, horses have an instinct which gels with the rider if you are working well as a team. That is why horses have been used in wars in the past (do you really think horses would willingly go towards cannons and gunfire?). It is the challenge of combining your horse riding skills with the skill of racing against the course and the competitors.
Its a different way of life from what probably the majority on here lead, but there are plenty of people who still rejoice in these skills and in the challenge of testing them. Racing is an ancient sport with an extensive history. I think its tragic that so many people are now so far removed from even basic skills of dealing with large animals or are unaware of the history of horse racing and indeed horsemanship in this country.
But yes, accidents do happen. Accidents happen in life all the time. If we all lived in little padded cells and never challenged ourselves, then we would presumably be safer. But would life be worth living?
Why bring animals into it, I hear you ask. Should horses only be left out in fields to look pretty? The history of humanity is in fact tied up with horsemanship skills. Most civilisations employed these skills to win wars and advance society. I personally like to see these links preserved in modern sporting contests.
Compare my horse to a racehorse. He is a 17.2 warmblood showjumper and 14 years old. If he were a racehorse he would be retired by now. Instead he is still competing most weekends (much more than a racehorse) and turning fast on his hocks against the clock. He is far too excitable to be ridden by a novice and needs to be stabled in winter. He is even too difficult for a novice to lead out in hand and feed (he bites), but fortunately for him, unliked most showjumpers, I hack him out. But he has never been ill treated, has loads of attention, the best of care and plenty of feed and exercise. I however have no interest in providing a horse which does not work with a giant field to roam in and expensive care, except when he has retired (he will have earned it). Generally though warmbloods have lower life expectancy than Throroughbreds.
NB racehorses tend to look exhausted but recover quickly. Don't go by looks alone. TV cameras hardly focus on fatal accidents since the general public want them to be glossed over.