I agree with the statement that there are way too many beautiful stallions out in the real world to breed one that is sub-par in attitude or conformation.
But with that said one thing I think we all overlook when dealing with show horses (particularly young show horses) is the fact that horses large or small are herd animals. They need and thrive on the socialization from being around other older and stronger horses that teach them "manners" so to speak.
In the big picture the constant sparring, nipping, chasing of horses within a herd is something you see all the time.
But with many of the show horses that are really good ones, they are taken into the barn as young horses, pampered, groomed, do not have a lot of contact with the rest of your herd and they develop bad habits. If these are not corrected by someone that is knowledgeable they get worse and manifest themselves into biting, kicking etc etc.
Let me relate an example using one of our horses for an example. I bought one of our herd stallions La Vista Farms Rose's First as a weanling. He was a gorgeous little guy and I fell in love with him. He was small and had really good confirmation. As a weanling he was reserve national champion out of a class of 46. The trainer is a very good one and the colt was born on the trainers farm and not on Susan's farm in California. So we left him with the trainer to be shown.
The little guy was left at the trainers over the winter to show him again the next year. Being a colt he was kept away from the other horses for the most part and not herd socialized as he normally would be. He started developing the habit of biting and rearing shortly after the start of the second show season with him. He did well in the ring, but was becoming a little terror to deal with.
We brought him home and he got even worse, to the point that I was considering gelding him or shooting him whichever came first(joke). As a last ditch effort I put him in the pasture with 4 older geldings about his same size. The wars that went on for several months were epic around here. Additionally we pulled him up daily and groomed him, enforced the rules of good behavior(our space, his space etc), loved on him and basically tried to let nature run its course, putting a time table on him of 1 year to start to come around.
OH!
Within about 3 months the turn around was dramatic, he is a real little gentleman now days and we enjoy being around him. He has gone on to produce many great babies for us over the last 5 or 6 years.
The point I guess I am trying to make is that many times we are the cause for many of the problems that our horses develop. Horses are horses even though they be small and when we do not deal with the minds as well as the physical attributes they have we are asking for trouble.
I cannot tell you the number of times we have seen unruly, bad mannered mini's being allowed to be that way merely because they were smaller and the owner either did not know how to correct the bad behavior or was not concerned about it. Only to see that same horse go to someone else that dealt with the problems and corrected them to benefit of the owners and the horse in question. Making the horse an asset as versus a handful to deal with.
By the way Carin, I applaud you on handling the situation you described the way you did. As always, I admire your ethics in handling things like this. Good for you. Sometimes a really good gelding is great end result. One of these days maybe folks in the nmini world will start putting as much value on good geldings as the rest of the horse world does.