I wish this went without saying, but I fear all this "new age horsemanship" may be confusing this for people.
I thought there was an inherent danger in working with horses, due to their size?
Remember this? Legal Update: Connecticut Horse Law | Practical Horseman Magazine
Then most states have this:
Under Massachusetts law, an equine professional is not liable for an injury to, or the death of, a participant in equine activities resulting from the inherent risks of equine activities, pursuant to section 2D of chapter 128 of the General Laws"
The problem is quite frankly you can't fix stupid, and for all the incredible things humans have done there are even more stupid ones.
Did anyone hear about the gorilla or was that local news? Some toddler got into the gorilla enclosure and the gorilla was shot to ensure the child's safety due to no fault of it's own. The parents were right there watching it.
People also see other people handling horses so assume they can too. They are beautiful and people feel the need to interact with things. Ultimately things are often the humans fault. They do think they are big dogs, cause dogs are friendly so everything else is too! And if the dog hurts them it's clearly an issue with the dog. Same with the horse. See the lawsuit above.
FWIW here's the "inherent risks" from above:
"''Inherent risks of equine activities'', dangers or conditions which are an integral part of equine activities, including but not limited to:
(1) The propensity of equines to behave in ways that may result in injury, harm, or death to persons on or around them; (2) the unpredictability of an equine's reaction to such things as sounds, sudden movement, and unfamiliar objects, persons, or other animals; (3) certain hazards such as surface and subsurface conditions; (4) collisions with other equines or objects; (5) the potential of a participant to act in a negligent manner that may contribute to injury to the participant or others, such as failing to maintain control over the animal or not acting within his ability."