The way it has been in the past and to some extent still now, I am against it:
1. Using whips to make the horses run faster is a form of animal cruelty.
2. Making the barriers so high that some horses end up falling, getting injured, and even dying, is a form of animal cruelty.
I don't think whips are allowed anymore, but the barriers are still too high, and many horses suffer many injuries - some fatal.
If the fences were made lower, and any other form of cruelty I'm not aware of were dealt with, then I would be okay with it.