killing animals isn't a sport

Compelling moral analysis of the "sport" of horse-racing. Horses are forced to run, and thus forced into dangerous situations. Obviously, the only humane thing to do in some injuries is euthanasia. If you cause the injury that leads to the euthanasia, isn't that murder? What makes horse-racing less brutal than dog-fighting or bull-fighting? The end result is the same: animals are abused and often killed for human entertainment. As the writer of the piece asks, why does horse-racing get a pass?