I do not know anything about horse racing one way or the other to even have an opinion about it on that perspective, all I know is that when horses break their legs it isn't like a human or cat or dog breaking their legs. Their anatomy is so different; they have ONE weight-bearing digit whereas us humans, cats and dogs (for example) have four/five. Not to mention the sheer weight of most of them its amazing if any horse IS able to survive a broken bone, much less two broken carpals!! Which bone was broken, does it say if it was the cannon? Regardless; euthanization was the most humane decision to make in that circumstance, IMO.