Snow White prefers the White Horse

During one of our conversations my sister told me about how horses are portrayed as evil or bad in some movies which involved exorcism like in the movie The Rite (http://www.imdb.com/title/tt1161864/) She said that horses are used by demons to possess a person according to some priests who have done exorcism(the act of driving out, or warding off, demons, or evil spirits, from persons, places, or things, which are believed to be possessed or infested by them, or are liable to become victims or instruments of their malice). By these observations I thought of getting more information about horses and how are they symbolized by others. According to this article (http://www.whats-your-sign.com/horse-symbol-meanings.html) horses symbolize power, grace, beauty, nobility, strength , freedom etc. A horse can serve man in war, can be a tool for mobility, productivity, agriculture, development of all kinds, the Horse is by far one of the largest contributor to the enhancement of civilization. How can we not love horses isn't it?.... but then I read on the last part of the article the difference between a White horse and a Black horse. A Black horse is usually meant to cause mystery, death, night, secret, a messenger of esoteric knowledge.....while the White horse symbolizes light, sun,day,vitality, illumination, resurrection, a messenger of birth. Therefore we can't totally conclude that horses are evil animals although we may say that some of them probably the Black horses have been used by demons when they want to possess their victims! Now I was looking at some photos of Kristen Stewart's upcoming movie Snow White and The Huntsman and in some of her scenes you can see her befriending a White horse which in my opinion isn't harmful at all coz this time the White horse agrees with Snow White the protagonist of the story I may say. Now this horse could beat the Evil Queen in the story, and it can't be possessed by Evil coz she is siding with the Good instead!