Although this is usually a pet related website, I've spend this week posting and reading about the Kentucky Derby, and more specifically, Eight Belles. Although I plan to get back to my other writings, I felt this is such an emotional issue and I wanted to add in my perspective for whatever it is worth (maybe 2 cents?).
PETA is accusing the jockey of knowing something was wrong with the horse before she fell. But keep this in mind....in any race it’s in the jockey's best interest that the horse is stable and healthy. The jockey is looking out for himself. If the horse goes down on the track, a number of unfortunate things can happen. This includes the horse potentially rolling over the jockey, or the jockey getting trampled by the other horses behind him.
This is why it is unlikely that the jockey felt anything before the horse went down. A horse going down can lead to major injuries and even death for that jockey. Who would really want to risk that?
The risk of falling down on the track are way too dangerous to ever push a horse farther then an injury will let it go.