I am always happy to see a racehorse retired -- it is not good for their bodies and there is always the chance of a catastrophic breakdown. (A much *higher* chance, please note, when the horse is in training and being campaigned than when he is at stud and just hangin' around in the field.)
Even without a major breakdown, an awful high percentage of racehorses, both good and not so good, do NOT retire sound. They very very often have all sorts of tendon, ligament and joint injuries that plague them for the rest of their lives, making them stiff and sore to varying degrees, and increasing the chances of a serious injury later on at pasture. (Even if they seem fine the day after they are retired, it typically becomes a real issue when they get to be 10 or 12, not very old for a horse).
You can say 'oh, well, that's the price that human athletes pay too' but you know what, human athletes can DECIDE whether they want to go down that road. Horses are incapable of informed consent, because they do not know and cannot be told of the risks and longer-term consequences of Fun On The Track. The longer a horse races, the more damage is done to its body.
And this horse in particular, as I understand it, has a lot of foot problems. Who knows whether they could even get his feet to keep holding together for the rest of the season. Ability is not the only thing in the equation.
So, me, I have no problem whatsoever with them saying they'll retire him. Is it just a greedy decision based on fear that he might start losing races and his stud fee value would drop? Who knows, could be. (It's hard enough to stay financially afloat in horse breeding that I wouldn't really fault them if that was their rationale, though). Or they may know something about his feet or soundness that you don't.
Doesn't matter to me which is which. I think that retirement is CLEARLY in the horse's best interest -- ANY racehorse's, provided there is a good home for him to live out the rest of his life -- and would be happy to see it.
Pat, having owned several off-the-track thoroughbreds over the years (2 out back right now), and having retrained gazillions, and a great admirer of the breed.