Most of the problems folks have with horses are really just symptoms. The problems folks have with our friends have been the same through out the centuries. No matter what discipline you're involved in the issues are all the same. The reason is because humans and horses will never change! For example the horse that refuses to load on the trailer, a real problem!!( really a symptom) is due to the fact the horse has never been taught to submit his will to yours. Kind of reminds you of some kids today. The basics of Natural Horsemanship will take care of most of all your symptoms.
So people will out of ignorance blame their horse for the problem. When the problem is really with you. Hard pill to swallow,I know I'm still learning too. Ignorance in horsemanship isn't bliss it can get you hurt.