This is so sad, that the economy was so bad, that people felt that it would be better to turn horses loose, than let them starve. I know the article does not say this, but this is why people let them loose to take care of them selves. I will have to check out the links.
Set Up a Animal Therapy Program.. and put the horses to use. Government can aide in setting up finically either for Paroles or for Developmetal Population. A Parole program would consist of having a trainer work with the wild horses and train them and the paroles to aide in connecting with the horses and the training. A suggestion!
I am a photographer of nature and landscape, I take photos of these beautiful horses all the time, they are so nice and friendly and the new ones born each year are curious, since I was young my father worked up on these coal mines and we would ride up there on his days off and see them all over the place. You can find alot of their photos on my photo page http://www.facebook.com/PhotosByTDH
Keep up the gelding clinics & they will slow down the herd growth. There is only so much grass & water. A good example is the ponies on the Atlantic coast islands.