^Their defense would be "use what we have". My response "Stop breeding junk!" Set goals, do your research, breed papered horses, and don't breed twelve in the hope for one "good one".
Now what are your thoughts on THIS scenario....
Suppose a healthy, well-bred pregnant mare carrying a potential superstar(carefully bred, and chosen on both sire and dam's side, and so forth) injured herself severely a month or so before she was due to foal. By everything, you feel the mare should be put down, but you have put so much into getting that foal. What would you do, supposing the mare did not abort? Would you put the mare down then and lose both? Let the mare live with her injury and treat her as best you can until she foaled, and then decide the best course of action, considering her recovery over the last month and how much farther you think she could progress?
That is a tough one no?