Not a fan of racing 3 year olds. They are basically teenagers. Their joints aren't closed. Lots of injuries that prevent them from continuing on, and then what? There are tons of thoroughbreds out there that need homes. Rehabbing an off the track thoroughbred (OTTB) is not for the faint of heart, from what I have heard. They need six or so months to decompress from life at the track. Their feet need to regroup because they are shod for racing. And, they are bred for running.
I have friends with OTTBs who adore them, however.
And, finally, I didn't watch the race, but a few friends said that the winner got pretty beat up for biting the outrider. I can't find anything on YouTube, but it probably got cut.