Vicki Jaeger And Marc the horse is a symbol for the previously angry, hurt, and arrogant man that was Marc's father. He went to LaPorte and his life was changed. He found peace. So it's amazing that he advocated to send the horse there, to try to help him find peace, instead of putting him down.
Mary I'm not sure that in real life, a skittish abused horse with biting tendencies would be sent to a special needs community (liability!) but it's a nice thought, that while there's breath, there's always hope.
Liz Meade La Porte (The Door) seemed much like Henri Nouwen's place of healing called "L'Arche (The Arch) where he went and cared for mentally disabled folk in Canada at the height of his writing career.